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The Best Alien TV Shows

Finding a good Alien TV show to watch can be hard, so we've ranked the best ones and included where to watch them. Check out our list of the best Alien TV shows of all time streaming online.

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1. Futurama

IMDB LogoIMDB Star
8.5/10
Rotten Tomatoes Logo95%
Reelgood Logo
85/100
Year: 1999-2019Rated: TV-14Seasons: 10
Science-Fiction, Animation

What it's about: The adventures of a late-20th-century New York City pizza delivery boy, Philip J. Fry, who, after being unwittingly cryogenically frozen for one thousand years, finds employment at Planet Express, an interplanetary delivery company in the retro-futuristic 31st century.

Where to Watch: 134 episodes (96%) are available to stream on a popular subscription service (Netflix & Hulu). 21 episodes (15%) are available to stream on a popular TV everywhere service (Syfy & Comedy Central). 138 episodes (99%) are available to rent or buy from $0.99 on 6 services (iTunes, Google Play & 4 others).

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2. The X-Files

IMDB LogoIMDB Star
8.7/10
Rotten Tomatoes Logo75%
Reelgood Logo
83/100
Year: 1993-2019Rated: TV-14Seasons: 11
Drama, Science-Fiction

What it's about: The exploits of FBI Special Agents Fox Mulder and Dana Scully who investigate X-Files: marginalized, unsolved cases involving paranormal phenomena. Mulder believes in the existence of aliens and the paranormal while Scully, a skeptic, is assigned to make scientific analyses of Mulder's discoveries that debunk Mulder's work and thus return him to mainstream cases.

Where to Watch: 5 episodes (2%) are available to watch free online (FOX & Yahoo View). 219 episodes (100%) are available to stream on a popular subscription service (Prime Video & Hulu). 208 episodes (95%) are available to stream on a TV everywhere service (BBC America & FOX). 219 episodes (100%) are available to rent or buy from $1.99 on 8 services (iTunes, Google Play & 6 others).

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3. Star Trek: The Next Generation

IMDB LogoIMDB Star
8.6/10
Rotten Tomatoes Logo89%
Reelgood Logo
80/100
Year: 1987-2019Rated: TV-PGSeasons: 7
Action & Adventure, Drama

What it's about: Follow the intergalactic adventures of Capt. Jean-Luc Picard and his loyal crew aboard the all-new USS Enterprise NCC-1701D, as they explore new worlds.

Where to Watch: 180 episodes (99%) are available to stream on a popular subscription service (Netflix, Hulu & 1 other). 180 episodes (99%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play, Prime Video & 3 others).

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4. Doctor Who

IMDB LogoIMDB Star
8.7/10
Rotten Tomatoes LogoN/A
Reelgood Logo
80/100
Year: 2005-2019Rated: TV-PGSeasons: 12
Action & Adventure, Drama

What it's about: The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a living – more of a hobby actually, and the Doctor's very, very good at it.

Where to Watch: 127 episodes (93%) are available to stream on a popular subscription service (Prime Video). 137 episodes (100%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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5. Star Trek

IMDB LogoIMDB Star
8.3/10
Rotten Tomatoes Logo80%
Reelgood Logo
78/100
Year: 1966-2019Rated: TV-PGSeasons: 3
Action & Adventure, Drama

What it's about: Space. The Final Frontier. The U.S.S. Enterprise embarks on a five year mission to explore the galaxy. The Enterprise is under the command of Captain James T. Kirk with First Officer Mr. Spock, from the planet Vulcan. With a determined crew, the Enterprise encounters Klingons, Romulans, time paradoxes, tribbles and genetic supermen lead by Khan Noonian Singh. Their mission is to explore strange new worlds, to seek new life and new civilizations, and to boldly go where no man has gone before.

Where to Watch: 2 episodes (3%) are available to watch free online (CBS). 79 episodes (100%) are available to stream on a popular subscription service (Netflix, Hulu & 1 other). 79 episodes (100%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play, Prime Video & 3 others).

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6. Battlestar Galactica

IMDB LogoIMDB Star
8.7/10
Rotten Tomatoes LogoN/A
Reelgood Logo
77/100
Year: 2004-2019Rated: TV-14Seasons: 4
Action & Adventure, Fantasy

What it's about: When an old enemy, the Cylons, resurface and obliterate the 12 colonies, the crew of the aged Galactica protect a small civilian fleet - the last of humanity - as they journey toward the fabled 13th colony, Earth.

Where to Watch: 73 episodes (95%) are available to stream on a popular subscription service (Prime Video & Hulu). 1 episodes (1%) are available to stream on a popular TV everywhere service (Syfy). 75 episodes (97%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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7. Star Trek: Discovery

IMDB LogoIMDB Star
7.4/10
Rotten Tomatoes Logo82%
Reelgood Logo
77/100
Year: 2017-2019Rated: TV-14Seasons: 2
Science-Fiction, Action & Adventure

What it's about: Follow the voyages of Starfleet on their missions to discover new worlds and new life forms, and one Starfleet officer who must learn that to truly understand all things alien, you must first understand yourself.

Where to Watch: 29 episodes (100%) are available to stream on a subscription service (CBS All Access). 15 episodes (52%) are available to rent or buy from $1.99 on 5 services (iTunes, Prime Video & 3 others).

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8. Farscape

IMDB LogoIMDB Star
8.3/10
Rotten Tomatoes Logo100%
Reelgood Logo
77/100
Year: 1999-2019Rated: TV-14Seasons: 5
Science-Fiction, Action & Adventure

What it's about: A freak accident during an experimental space mission catapults Astronaut John Crichton across a thousand galaxies to an alien battlefield.

Where to Watch: 88 episodes (98%) are available to rent or buy from $1.99 on 2 services (Google Play & YouTube).

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9. Smallville

IMDB LogoIMDB Star
7.5/10
Rotten Tomatoes Logo92%
Reelgood Logo
76/100
Year: 2001-2019Rated: TV-PGSeasons: 11
Action & Adventure, Drama

What it's about: The origins of the world’s greatest hero–from Krypton refugee Kal-el’s arrival on Earth through his tumultuous teen years to Clark Kent’s final steps toward embracing his destiny as the Man of Steel.

Where to Watch: 220 episodes (99%) are available to stream on a popular subscription service (Hulu). 219 episodes (98%) are available to rent or buy from $0.99 on 8 services (iTunes, Google Play & 6 others).

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10. Star Trek: Deep Space Nine

IMDB LogoIMDB Star
7.9/10
Rotten Tomatoes Logo90%
Reelgood Logo
76/100
Year: 1993-2019Rated: TV-PGSeasons: 7
Action & Adventure, Drama

What it's about: Star Trek: Deep Space Nine is a science fiction television series set in the Star Trek universe.The show is set in the Milky Way galaxy, in the years 2369 - 2375. Unlike the other Star Trek TV shows, it takes place on a space station instead of a starship, so as not to have two series with starships at the same time. This made continuing story arcs and the appearance of recurring characters much more feasible. The show is noted for its well-developed characters and its original, complex plots. The series depended on darker themes, less physical exploration of space, and an emphasis on many aspects of war.DS9 premiered in 1993 and ran for seven seasons, ending in 1999. Rooted in Gene Roddenberry’s Star Trek universe, it was the first Trek spin-off created without direct involvement from Roddenberry, although he did give his blessing to the concept shortly before his death in 1991. The series was created by Rick Berman and Michael Piller, at the request of Brandon Tartikoff, and produced by Paramount Television. Key writers, in addition to Berman and Piller, included showrunner Ira Steven Behr, Robert Hewitt Wolfe, Ronald D. Moore, Peter Allan Fields, Bradley Thompson, David Weddle, Hans Beimler, and René Echevarria.

Where to Watch: 175 episodes (98%) are available to stream on a popular subscription service (Netflix, Hulu & 1 other). 179 episodes (100%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play, Prime Video & 3 others).

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11. Stargate SG-1

IMDB LogoIMDB Star
8.4/10
Rotten Tomatoes LogoN/A
Reelgood Logo
75/100
Year: 1997-2019Rated: TV-PGSeasons: 10
Action & Adventure, Fantasy

What it's about: The story of Stargate SG-1 begins about a year after the events of the feature film, when the United States government learns that an ancient alien device called the Stargate can access a network of such devices on a multitude of planets. SG-1 is an elite Air Force special operations team, one of more than two dozen teams from Earth who explore the galaxy and defend against alien threats such as the Goa'uld, Replicators, and the Ori.

Where to Watch: 215 episodes (100%) are available to stream on a popular subscription service (Prime Video & Hulu). 213 episodes (99%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play & 3 others).

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12. Star Trek: Voyager

IMDB LogoIMDB Star
7.7/10
Rotten Tomatoes Logo77%
Reelgood Logo
73/100
Year: 1995-2019Rated: TV-PGSeasons: 7
Action & Adventure, Drama

What it's about: Pulled to the far side of the galaxy, where the Federation is 75 years away at maximum warp speed, a Starfleet ship must cooperate with Maquis rebels to find a way home.

Where to Watch: 173 episodes (99%) are available to stream on a popular subscription service (Netflix, Hulu & 1 other). 174 episodes (99%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play, Prime Video & 3 others).

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13. TRIGUN

IMDB LogoIMDB Star
8.3/10
Rotten Tomatoes Logo100%
Reelgood Logo
73/100
Year: 1998-2019Rated: TV-PGSeasons: 1
Action & Adventure, Anime

What it's about: Trigun takes place in the distant future on a deserted planet. Vash the Stampede is a gunfighter with a legend so ruthless he has a $60,000,000,000 bounty on his head. Entire towns evacuate at the rumor of his arrival. But the real Vash the Stampede, the enigmatic and conflicted lead character in Trigun, is more heroic, even though he usually acts like a complete idiot.

Where to Watch: 26 episodes (100%) are available to watch free online (Sony Crackle, Tubi TV & Yahoo View). 26 episodes (100%) are available to stream on a popular subscription service (Hulu). 26 episodes (100%) are available to rent or buy from $1.99 on 3 services (iTunes, Google Play & Prime Video).

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14. Stargate Universe

IMDB LogoIMDB Star
7.7/10
Rotten Tomatoes Logo70%
Reelgood Logo
72/100
Year: 2009-2019Rated: TV-14Seasons: 2
Action & Adventure, Science-Fiction

What it's about: The adventures of a present-day, multinational exploration team traveling on the Ancient spaceship Destiny many billions of light years distant from the Milky Way Galaxy. They evacuated there and are now trying to figure out a way to return to Earth, while simultaneously trying to explore and to survive in their unknown area of the universe.

Where to Watch: 40 episodes (100%) are available to stream on a popular subscription service (Prime Video & Hulu). 40 episodes (100%) are available to rent or buy from $1.99 on 4 services (iTunes, Google Play & 2 others).

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15. Falling Skies

IMDB LogoIMDB Star
7.2/10
Rotten Tomatoes Logo79%
Reelgood Logo
72/100
Year: 2011-2019Rated: TV-14Seasons: 5
Action & Adventure, Science-Fiction

What it's about: Falling Skies opens in the chaotic aftermath of an alien attack that has left most of the world completely incapacitated. In the six months since the initial invasion, the few survivors have banded together outside major cities to begin the difficult task of fighting back. Each day is a test of survival as citizen soldiers work to protect the people in their care while also engaging in an insurgency campaign against the occupying alien force.

Where to Watch: 52 episodes (100%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play & 3 others).

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16. Defiance

IMDB LogoIMDB Star
7.0/10
Rotten Tomatoes Logo77%
Reelgood Logo
71/100
Year: 2013-2019Rated: TV-MASeasons: 3
Action & Adventure, Drama

What it's about: Defiance is an American science fiction television show that takes place in the future on a radically transformed Earth containing new species arriving from space. In the show, Joshua Nolan works as the lawman for the town of Defiance, a community where humans and intelligent extraterrestrial species coexist. The show follows Nolan, his adopted alien daughter Irisa, and the town's new mayor Amanda Rosewater.

Where to Watch: 38 episodes (97%) are available to stream on a popular subscription service (Prime Video). 39 episodes (100%) are available to rent or buy from $1.99 on 8 services (iTunes, Google Play & 6 others).

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17. Star Trek: Enterprise

IMDB LogoIMDB Star
7.5/10
Rotten Tomatoes Logo50%
Reelgood Logo
70/100
Year: 2001-2019Rated: TV-PGSeasons: 4
Action & Adventure, Drama

What it's about: During the mid-22nd century, a century before Captain Kirk's five-year mission, Jonathan Archer captains the United Earth ship Enterprise during the early years of Starfleet, leading up to the Earth-Romulan War and the formation of the Federation.

Where to Watch: 99 episodes (100%) are available to stream on a popular subscription service (Netflix, Hulu & 1 other). 99 episodes (100%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play, Prime Video & 3 others).

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18. Stargate Atlantis

IMDB LogoIMDB Star
8.1/10
Rotten Tomatoes LogoN/A
Reelgood Logo
69/100
Year: 2004-2019Rated: TV-PGSeasons: 5
Action & Adventure, Science-Fiction

What it's about: With the Ancients' city of Atlantis discovered in the Pegasus Galaxy by Stargate Command, Dr. Elizabeth Weir and Major Sheppard lead a scientific expedition to the ancient abandoned city. Once there, the team not only find themselves unable to contact Earth, but their explorations unexpectedly reawaken the Ancients' deadly enemies, The Wraith, who hunger for this new prey. Now with the help of newfound local allies like Teyla Emmagan, the Atlantis Team sets about to uncover their new home's secrets even as their war of survival against the Wraith begins.

Where to Watch: 101 episodes (100%) are available to stream on a popular subscription service (Hulu). 101 episodes (100%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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19. Doctor Who

IMDB LogoIMDB Star
8.4/10
Rotten Tomatoes Logo68%
Reelgood Logo
67/100
Year: 1963-2019Rated: TV-PGSeasons: 27
Action & Adventure, Science-Fiction

What it's about: The adventures of a Time Lord—a time-travelling humanoid alien known as the Doctor—who explores the universe in his TARDIS, a sentient time-travelling space ship. Its exterior appears as a blue British police box, which was a common sight in Britain in 1963 when the series first aired. Along with a succession of companions, the Doctor faces a variety of foes while working to save civilisations, help ordinary people, and right wrongs.

Where to Watch: 607 episodes (86%) are available to stream on a popular subscription service (Prime Video & BritBox). 344 episodes (49%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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20. FLCL

IMDB LogoIMDB Star
8.3/10
Rotten Tomatoes LogoN/A
Reelgood Logo
67/100
Year: 2000-2019Rated: TV-MASeasons: 3
Animation, Anime

What it's about: A 12-year old boy named Naota one day meets a strange woman, riding a Vespa and wielding a big guitar. As soon as she appears, mysterious things start happening.

Where to Watch: 16 episodes (84%) are available to watch free online (Adult Swim & Yahoo View). 6 episodes (32%) are available to stream on a popular subscription service (Hulu). 2 episodes (11%) are available to stream on a TV everywhere service (Adult Swim). 6 episodes (32%) are available to rent or buy from $1.99 on 3 services (iTunes, Google Play & Prime Video).

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21. BrainDead

IMDB LogoIMDB Star
8.1/10
Rotten Tomatoes Logo65%
Reelgood Logo
67/100
Year: 2016-2019Rated: TV-14Seasons: 1
Drama, Horror

What it's about: A young fresh-faced Hill staffer gets her first job in Washington, D.C. and discovering two things: 1. The government has stopped working, and 2. alien spawn have come to earth and eaten the brains of a growing number of Congressmen and Hill staffers.

Where to Watch: 13 episodes (100%) are available to stream on a popular subscription service (Prime Video & CBS All Access). 13 episodes (100%) are available to rent or buy from $1.99 on 1 service (Prime Video).

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22. Krypton

IMDB LogoIMDB Star
7.1/10
Rotten Tomatoes Logo61%
Reelgood Logo
67/100
Year: 2018-2019Rated: TV-14Seasons: 1
Action & Adventure, Science-Fiction

What it's about: Set two generations before the destruction of the legendary Man of Steel’s home planet, Krypton follows Superman’s grandfather — whose House of El was ostracized and shamed — as he fights to redeem his family’s honor and save his beloved world from chaos.

Where to Watch: 11 episodes (100%) are available to rent or buy from $1.99 on 4 services (iTunes, Prime Video & 2 others).

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23. Extant

IMDB LogoIMDB Star
6.6/10
Rotten Tomatoes Logo77%
Reelgood Logo
66/100
Year: 2014-2019Rated: TV-14Seasons: 2
Drama, Science-Fiction

What it's about: An astronaut returns home from a year long solo mission in space. She tries to reconnect with her husband and son in their everyday life. Her experiences in space and home lead to events that ultimately will change the course of human history.

Where to Watch: 24 episodes (92%) are available to stream on a popular subscription service (Prime Video & CBS All Access). 24 episodes (92%) are available to rent or buy from $1.99 on 1 service (Prime Video).

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24. 3rd Rock from the Sun

IMDB LogoIMDB Star
7.8/10
Rotten Tomatoes LogoN/A
Reelgood Logo
66/100
Year: 1996-2019Rated: TV-PGSeasons: 6
Comedy, Science-Fiction

What it's about: 3rd Rock from the Sun is an American sitcom that aired from 1996 to 2001 on NBC. The show is about four extraterrestrials who are on an expedition to Earth, which they consider to be a very insignificant planet. The extraterrestrials pose as a human family in order to observe the behavior of human beings.

Where to Watch: 139 episodes (100%) are available to watch free online (Tubi TV). 139 episodes (100%) are available to stream on a popular subscription service (Prime Video). 139 episodes (100%) are available to rent or buy from $1.99 on 1 service (Prime Video).

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25. Star-Crossed

IMDB LogoIMDB Star
7.4/10
Rotten Tomatoes Logo57%
Reelgood Logo
66/100
Year: 2014-2019Rated: TV-14Seasons: 1
Drama, Science-Fiction

What it's about: When Emery was 6 years old, an alien spacecraft crash-landed in her small town. Whether they came in peace or with more sinister intentions didn't matter: a fierce battle erupted as humans fought for control over their new rivals, an alien species called the Atrians. In the midst of the conflict, Roman, a 6-year-old Atrian boy, found his way to a shed behind Emery's house, where she temporarily protected him from harm, bringing him food, comfort - and friendship. Ten years later, the Atrians have been acclimated to life on Earth, but they are interned in a heavily-guarded camp known as the Sector to keep them separate from humans. Now, for the first time, a group of Atrian teens will enroll in a suburban human high school, with the goal of testing the feasibility of human/alien integration. Emery and Roman find each other again in a school and a society that distrusts everything about the Atrians. While the world around them rages with anger and prejudice, their bond becomes increasingly strong and increasingly dangerous.

Where to Watch: 13 episodes (100%) are available to stream on a popular subscription service (Netflix). 13 episodes (100%) are available to rent or buy from $0.99 on 3 services (iTunes, Prime Video & Vudu).

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26. Caprica

IMDB LogoIMDB Star
7.1/10
Rotten Tomatoes Logo81%
Reelgood Logo
66/100
Year: 2010-2019Rated: TV-14Seasons: 1
Drama, Science-Fiction

What it's about: Set 58 years before Battlestar Galactica, Caprica follows two rival families - the Graystones and the Adamas - as they grow, compete, and thrive in the vibrant world of the peaceful 12 Colonies, living in a society close to our own. Entangled in the burgeoning technology of artificial intelligence and robotics that will eventually lead to the creation of the Cylons, the two houses go toe-to-toe, blending action with corporate conspiracy and sexual politics.

Where to Watch: 20 episodes (100%) are available to rent or buy from $1.99 on 7 services (iTunes, Google Play & 5 others).

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27. V

IMDB LogoIMDB Star
7.3/10
Rotten Tomatoes Logo47%
Reelgood Logo
66/100
Year: 2009-2019Rated: TV-14Seasons: 2
Drama, Science-Fiction

What it's about: V is an American science fiction television series that ran for two seasons on ABC, from November 3, 2009 to March 15, 2011. A remake of the 1983 miniseries created by Kenneth Johnson, the new series chronicles the arrival on Earth of a technologically advanced alien species which ostensibly comes in peace, but actually has sinister motives. V stars Morena Baccarin, Lourdes Benedicto, Morris Chestnut, Joel Gretsch, Logan Huffman, Charles Mesure, Elizabeth Mitchell, Laura Vandervoort and Scott Wolf, and was executive produced by Scott Rosenbaum, Yves Simoneau, Scott Peters, and Jace Hall. The series was produced by The Scott Peters Company, HDFilms and Warner Bros. Television.

Where to Watch: 22 episodes (76%) are available to stream on a popular subscription service (Prime Video). 29 episodes (100%) are available to rent or buy from $1.99 on 4 services (iTunes, Google Play & 2 others).

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28. Parasyte -the maxim-

IMDB LogoIMDB Star
8.4/10
Rotten Tomatoes LogoN/A
Reelgood Logo
65/100
Year: 2014-2019Rated: TV-MASeasons: 1
Action & Adventure, Anime

What it's about: Shinichi Izumi is a normal high school boy whose right hand has become infected with an alien parasite that names itself "Migi" ("right"). Migi is the first parasite to develop a symbiotic relationship with its host, as he and Shinichi slowly develop a grudging friendship. Migi isn't the only Parasite on earth, however, and as cases of Parasites killing humans begin to emerge, humans seek to kill off Parasites. Shinichi and Migi find themselves caught in between these two sides of the struggle over planet earth.

Where to Watch: 25 episodes (100%) are available to watch free online (Crunchyroll & Yahoo View). 24 episodes (96%) are available to stream on a popular subscription service (Hulu). 24 episodes (96%) are available to rent or buy from $1.99 on 2 services (iTunes & Prime Video).

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29. Torchwood

IMDB LogoIMDB Star
7.8/10
Rotten Tomatoes LogoN/A
Reelgood Logo
65/100
Year: 2006-2019Rated: TV-MASeasons: 5
Action & Adventure, Crime

What it's about: Torchwood is a British science fiction television programme created by Russell T Davies. The series is a spin-off from the 2005 revival of the long-running science fiction programme Doctor Who. Torchwood follows the exploits of a small team of alien hunters, who make up the Cardiff branch of the fictional Torchwood Institute, which deals mainly with incidents involving extraterrestrials.

Where to Watch: 41 episodes (100%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play & 3 others).

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30. Roswell

IMDB LogoIMDB Star
7.5/10
Rotten Tomatoes LogoN/A
Reelgood Logo
64/100
Year: 1999-2019Rated: TV-14Seasons: 3
Drama, Science-Fiction

What it's about: Bizarre things start happening in the little New Mexico town where UFOs were spotted in 1947. Cut to 1999, when a cute high-school student saves the life of a teenage waitress. Surrounded by cliques of clever, angst-filled classmates, the two form a bond that threatens the survival of a secret universe involving superhuman powers, a yen for hot sauce and an alien gene pool.

Where to Watch: 61 episodes (100%) are available to stream on a popular subscription service (Hulu). 61 episodes (100%) are available to rent or buy from $1.99 on 5 services (iTunes, Google Play & 3 others).

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31. The Event

IMDB LogoIMDB Star
7.0/10
Rotten Tomatoes Logo67%
Reelgood Logo
64/100
Year: 2010-2019Rated: TV-14Seasons: 1
Action & Adventure, Drama

What it's about: The Event is an emotional, high-octane conspiracy thriller that follows Sean Walker, an everyman who investigates the mysterious disappearance of his would-be fiancée Leila, and unwittingly begins to expose the biggest cover-up in U.S. history.

Where to Watch: 22 episodes (100%) are available to watch free online (NBC). 22 episodes (100%) are available to stream on a popular subscription service (Hulu). 22 episodes (100%) are available to stream on a TV everywhere service (NBC). 22 episodes (100%) are available to rent or buy from $1.99 on 8 services (iTunes, Google Play & 6 others).

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32. Ancient Aliens

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7.4/10
Rotten Tomatoes LogoN/A
Reelgood Logo
63/100
Year: 2010-2019Rated: TV-PGSeasons: 13
Documentary, History

What it's about: Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.

Where to Watch: 14 episodes (7%) are available to watch free online (History). 159 episodes (84%) are available to stream on a popular subscription service (Prime Video & Hulu). 162 episodes (86%) are available to stream on a TV everywhere service (History). 179 episodes (95%) are available to rent or buy from $1.99 on 7 services (iTunes, Google Play & 5 others).

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33. Sliders

IMDB LogoIMDB Star
7.4/10
Rotten Tomatoes LogoN/A
Reelgood Logo
63/100
Year: 1995-2019Rated: TV-PGSeasons: 5
Action & Adventure, Science-Fiction

What it's about: In his basement in San Francisco, boy-genius Quinn Mallory unlocks the doorway to an infinite number of Earths. During a test run, Quinn invites co-worker Wade Wells and his teacher Professor Maximillian Arturo to see his new invention. But an increase in power and an early departure leave all three, plus a washed-up soul singer named Rembrandt "Crying Man" Brown, lost in a parallel world. Now they must "slide" from world to world, not only adapting to their changing surroundings, but also trying to get back to their world. Will they ever make it home?

Where to Watch: 9 episodes (10%) are available to stream on a popular subscription service (Hulu). 87 episodes (99%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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34. Justice League

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8.6/10
Rotten Tomatoes LogoN/A
Reelgood Logo
63/100
Year: 2001-2019Rated: TV-PGSeasons: 5
Action & Adventure, Animation

What it's about: Justice League is an American animated television series which ran from 2001 to 2004 on Cartoon Network. It is part of the DC animated universe. The show was produced by Warner Bros. Animation. It is based on the Justice League of America and associated comic book characters published by DC Comics. After the second season, the series was renamed Justice League Unlimited, and aired for an additional three seasons.

Where to Watch: 91 episodes (100%) are available to rent or buy from $0.99 on 6 services (iTunes, Google Play & 4 others).

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35. ALF

IMDB LogoIMDB Star
7.4/10
Rotten Tomatoes LogoN/A
Reelgood Logo
63/100
Year: 1986-2019Rated: TV-GSeasons: 4
Comedy, Family

What it's about: A furry alien wiseguy comes to live with a terran family after crashing into their garage.

Where to Watch: 103 episodes (99%) are available to watch free online (Tubi TV). 1 episodes (1%) are available to stream on a subscription service (ComicCon HQ). 104 episodes (100%) are available to rent or buy from $0.99 on 3 services (iTunes, Prime Video & Microsoft).

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36. The First

IMDB LogoIMDB Star
6.7/10
Rotten Tomatoes Logo68%
Reelgood Logo
63/100
Year: 2018-2019Rated: TV-MASeasons: 1
Drama, Science-Fiction

What it's about: Follow the first human mission to Mars, exploring the challenges of taking the first steps toward interplanetary colonization. The story focuses not only on the astronauts, but also on their families and loved ones, as well as the ground team on Earth.

Where to Watch: 8 episodes (100%) are available to stream on a popular subscription service (Hulu).

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37. Roswell, New Mexico

IMDB LogoIMDB Star
6.0/10
Rotten Tomatoes Logo53%
Reelgood Logo
63/100
Year: 2019-2019Rated: TV-14Seasons: 1
Drama, Mystery

What it's about: After reluctantly returning to her tourist-trap hometown of Roswell, New Mexico, the daughter of undocumented immigrants discovers a shocking truth about her teenage crush who is now a police officer: He’s an alien who has kept his unearthly abilities hidden his entire life. She protects his secret as the two reconnect and begin to investigate his origins, but when a violent attack and long-standing government cover-up point to a greater alien presence on Earth, the politics of fear and hatred threaten to expose him and destroy their deepening romance.

Where to Watch: 5 episodes (38%) are available to watch free online (The CW). 13 episodes (100%) are available to stream on a popular subscription service (Netflix). 13 episodes (100%) are available to rent or buy from $1.99 on 1 service (Vudu).

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38. Class

IMDB LogoIMDB Star
7.0/10
Rotten Tomatoes Logo84%
Reelgood Logo
63/100
Year: 2016-2019Rated: TV-14Seasons: 1
Drama, Science-Fiction

What it's about: Coal Hill School has been a feature of Doctor Who since the first episode, but now we get to see the day-to-day adventures of the students coping with intrusions from space and time.

Where to Watch: 8 episodes (100%) are available to stream on a popular subscription service (Prime Video). 8 episodes (100%) are available to rent or buy from $1.99 on 7 services (iTunes, Google Play & 5 others).

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39. V

IMDB LogoIMDB Star
7.9/10
Rotten Tomatoes LogoN/A
Reelgood Logo
63/100
Year: 1983-2019Rated: TV-14Seasons: 3
Drama, Science-Fiction

What it's about: It debuted in 1983 as the two-part television miniseries V, written and directed by Johnson. It was followed in 1984 by a three-part miniseries, V: The Final Battle, and a one-hour weekly television series, V during the 1984-85 television season.A number of novels, comic books, video games and other media have been spun off from the franchise. Johnson's novel V: The Second Generation, an alternative sequel to the first miniseries which disregards V: The Final Battle and V: The Series, was released on February 5, 2008. Johnson claimed he was in negotiations for a TV adaptation of his sequel novel, but in October 2008, Warner Bros. Television announced they were producing a complete remake of V instead. This new V series ran for two truncated seasons on ABC, from November 3, 2009 to March 15, 2011.

Where to Watch: 3 episodes (7%) are available to rent or buy from $1.99 on 2 services (Google Play & Prime Video).

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40. People of Earth

IMDB LogoIMDB Star
7.7/10
Rotten Tomatoes Logo92%
Reelgood Logo
62/100
Year: 2016-2019Rated: TV-MASeasons: 2
Comedy, Mystery

What it's about: Skeptical journalist Ozzie Graham investigates a support group for alien abductees to write about the members' supposed encounters. The more he digs into their oddball claims, the more he realizes there is truth in their stories and possibly even signs that point to his own alien abduction.

Where to Watch: 9 episodes (56%) are available to rent or buy from $1.99 on 4 services (Prime Video, Microsoft & 2 others).

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41. Teenage Mutant Ninja Turtles

IMDB LogoIMDB Star
7.9/10
Rotten Tomatoes LogoN/A
Reelgood Logo
62/100
Year: 2012-2019Rated: TV-PGSeasons: 5
Action & Adventure, Animation

What it's about: The Teenage Mutant Ninja Turtles are back in an all-new animated series on Nickelodeon! Surfacing topside for the first time on their fifteenth birthday, the titular turtles, Leonardo, Michelangelo, Raphael and Donatello, find that life out of the sewers isn't exactly what they thought it would be. Now the turtles must work together as a team to take on new enemies that arise to take over New York City.

Where to Watch: 120 episodes (97%) are available to stream on a popular subscription service (Hulu). 115 episodes (93%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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42. Green Lantern: The Animated Series

IMDB LogoIMDB Star
8.1/10
Rotten Tomatoes Logo100%
Reelgood Logo
61/100
Year: 2011-2019Rated: TV-PGSeasons: 1
Action & Adventure, Animation

What it's about: Green Lantern: The Animated Series is an American computer-animated television series based on the DC Comics superhero Green Lantern. The series is currently airing on Cartoon Network, as part of their "DC Nation" television block. A one hour sneak peek aired on November 11, 2011 it ran from November 11, 2011 to March 16, 2013, with a new episode airing every week. A special screening of the first episode was shown at New York Comic Con 2011 on October 15, 2011. This is the first Green Lantern television series and the first CGI DC/WB series. The series was cancelled after one season due to poor toy sales from the live-action movie, and because Cartoon Network wanted to emphasize new shows in its "DC Nation" block.

Where to Watch: 25 episodes (96%) are available to rent or buy from $0.99 on 6 services (iTunes, Google Play & 4 others).

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43. The Outer Limits

IMDB LogoIMDB Star
7.8/10
Rotten Tomatoes LogoN/A
Reelgood Logo
60/100
Year: 1995-2019Rated: TV-MASeasons: 7
Science-Fiction, Drama

What it's about: The Outer Limits is an anthology series of distinct story episodes, sometimes with a plot twist at the end. Unlike the original incarnation of the series, which was a pure anthology with each episode completely unrelated to the others, the revival series maintained an anthology format, but occasionally featured recurring story elements that were often tied together during season-finale clip shows.

Where to Watch: 153 episodes (98%) are available to stream on a popular subscription service (Hulu). 153 episodes (98%) are available to rent or buy from $1.99 on 2 services (iTunes & Prime Video).

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44. The Whispers

IMDB LogoIMDB Star
7.3/10
Rotten Tomatoes Logo74%
Reelgood Logo
59/100
Year: 2015-2019Rated: TV-14Seasons: 1
Drama, Mystery

What it's about: We love to play games with our children. But what happens when someone else starts to play with them too? Someone we don't know. Can't see. Can't hear. In The Whispers, someone or something -- is manipulating the ones we love most to accomplish the unthinkable. An unseen alien force has figured this human weakness out. They have invaded earth and are using our most unlikely resource to achieve world domination – our children.

Where to Watch: 13 episodes (100%) are available to rent or buy from $1.99 on 6 services (iTunes, Google Play & 4 others).

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45. The Hitchhiker's Guide to the Galaxy

IMDB LogoIMDB Star
8.0/10
Rotten Tomatoes Logo67%
Reelgood Logo
59/100
Year: 1981-2019Rated: TV-PGSeasons: 1
Comedy, Science-Fiction

What it's about: Don't Panic! The story of Arthur Dent, an average Englishman who life was spared by his friend, who turned out to be an alien, while the planet Earth is destroyed. His friend tells him about the Hitchhiker's Guide to the Galaxy, a guide with anything you ever needed, and wanted to know. They travel across the galaxy, meeting friendly, and not so friendly characters in order to find the great question (the answer being 42).

Where to Watch: 6 episodes (100%) are available to stream on a popular subscription service (Prime Video, Hulu & BritBox). 6 episodes (100%) are available to rent or buy from $1.99 on 2 services (Prime Video & Vudu).

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46. Childhood's End

IMDB LogoIMDB Star
6.9/10
Rotten Tomatoes Logo70%
Reelgood Logo
58/100
Year: 2015-2019Rated: TV-14Seasons: 1
Science-Fiction, Drama

What it's about: The peaceful alien invasion of Earth by the mysterious “Overlords,” whose arrival begins decades of apparent utopia under indirect alien rule, at the cost of human identity and culture.

Where to Watch: 3 episodes (100%) are available to rent or buy from $3.99 on 6 services (iTunes, Google Play & 4 others).

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47. He-Man and the Masters of the Universe

IMDB LogoIMDB Star
7.5/10