H2O: Just Add Water
H2O: Just Add Water revolves around three teenage girls facing everyday teen problems with an added twist: they cope with the burden of growing a giant fin and transforming into mermaids whenever they come in contact with water.
Where to Watch H2O: Just Add Water
Where to stream every episode from all 3 seasons of H2O: Just Add Water. Filter these episodes by what's available to watch free or on your streaming services using the tabs above.
Season 1Netflix | Prime Video | Hulu | Rent or Buy
S01 E01Jul 5, 2006
Metamorphosis Jul 5, 2006 Three very different teenage girls, Emma, Cleo and Rikki, facing everyday teenage problems. With a twist: they're mermaids; after discovering a magic place where they are given incredible powers over water that change their lives forever.
S01 E02Jul 13, 2006
Pool Party Jul 13, 2006 Annoying Miss Popularity, Miriam, is having a pool party and the girls want to go. But being around water is risky, especially when Zane tosses Cleo into the pool. Lewis is the only one around to help so he finds out their secret.
S01 E03Jul 20, 2006
Catch of the Day Jul 20, 2006 Rikki, Emma and Cleo discover that sea turtles are being captured by fishing nets. When Rikki and Emma attempt to rescue the turtles by cutting the nets, it causes the fisherman to think that there is a rogue shark roaming their ocean.
S01 E04Jul 27, 2006
Party Girls Jul 27, 2006 Emma decides that she is not going to have her annual sleepover party due to what has happened to them. But Rikki and Cleo try to convince her otherwise. Meanwhile, Lewis conducts experiments on the girls.
S01 E05Aug 3, 2006
Something Fishy Aug 3, 2006 Cleo's sister Kim finds her diary and thinks that Cleo and her friends are 'evil mermaids' and she plans to tell everyone. Meanwhile, Lewis goes to Mako Island to find out more about what happened to the girls.
S01 E06Aug 10, 2006
Young Love Aug 10, 2006 Emma gets into trouble babysitting her little brother Elliot. She goes to Lewis for help when Elliot develops a crush on Rikki.
Season 2Netflix | Prime Video | Hulu | Rent or Buy
S02 E01Sep 27, 2007
Stormy Weather Sep 27, 2007 With Cleo's parents now divorced, Cleo is ordered by her dad to take more care of Kim, starting with taking her to a concert. But on the night, Cleo, Rikki and Emma all accidentally see the full moon, and take off to Mako Island, with Lewis in hot pursuit. Once there, the girls undergo another magical transformation in the Moon Pool, as a rare planetary alignment intensifies the power of the full moon – Emma's power is enhanced so that she can produce snow and frost, Rikki can conjure lightning, and Cleo can now control wind as well as water. After the moonstruck girls nearly harm Lewis, they realise that they must work to control their new powers, before anyone else gets hurt.
S02 E02Oct 4, 2007
Control Oct 4, 2007 The girls have problems with their new powers and Cleo finds that Lewis isn't helping. A new girl called Charlotte arrives and develops a crush on a certain charecter
S02 E03Oct 11, 2007
The One That Got Away Oct 11, 2007 Rikki tries to avoid Zane when he comes back, but needs his help after an incident with a speedboat. Meanwhile, Charlotte continues to flirt with Lewis and Cleo worries for their secret.
S02 E04Oct 18, 2007
Fire and Ice Oct 18, 2007 Trouble arises when Emma throws a party to prove she is as fun as Rikki. Meanwhile, Lewis is trying to prove his manhood and Cleo is recieving cards from a secret admirer
S02 E05Oct 25, 2007
Hocus Pocus Oct 25, 2007 Trouble is in the air as the Setori's start to suffer and the JuiceNet is endangered by a new bar. But when Lewis finds a book of mermaid spells, the girls attempt to use a potion to fix everything. However, things aren't so easy when you have special powers.
S02 E06Nov 1, 2007
Pressure Cooker Nov 1, 2007 Cleo is worried when she sees her dad around with another woman. When she arrives at their house, she turns out to be Charlotte's mother! Meanwhile, Rikki and Emma attempt to save the Sertori's dinner with their powers.
Season 3Netflix | Prime Video | Hulu | Rent or Buy
S03 E01Oct 25, 2009
The Awakening Oct 25, 2009 Cleo and Rikki enter their final year of high school. They make friends with a new girl, Bella, and a new boy, Will. However, they encounter a new force on Mako Island that has the power to turn water against the girls.
S03 E02Oct 26, 2009
Jungle Hunt Oct 26, 2009 With Will finding out about Mako Island, Bella tries to misdirect his search so that he will not discover the Moon Pool. However, Lewis and the girls find out that the Moon Pool is different.
S03 E03Oct 27, 2009
Keep Your Enemies Close Oct 27, 2009 At the marine park, Cleo seeks a job as a dolphin trainer. Meanwhile, until she and Bella reach an understanding, Rikki fires Nate's band, preventing them from playing in the cafe.
S03 E04Oct 28, 2009
Valentines Day Oct 28, 2009 Cleo has to put off Lewis' romance plans in order to help Kim with her crazy love life. Meanwhile, Don meets up with a National Parks Manager, Samantha, and the two decide to date.
S03 E05Oct 29, 2009
Big Ideas Oct 29, 2009 To get more interest in the cafe, Zane develops a dirt bike race. However, Rikki finds out that it is a scam. She and Bella decide to team up to teach him a lesson. Meanwhile, Lewis and Cleo find out something interesting about mixing the waters in the Moon Pool
S03 E06Nov 1, 2009
Secrets and Lies Nov 1, 2009 Bella tries to get close to Will but when Bella goes to his place she sees him with another girl. Meanwhile Lewis tries to test the water from the moon pool but gets caught by his teacher.
S03 E07Nov 2, 2009
Happy Families Nov 2, 2009 Cleo's family and Sam go on a picnic to the beach, which leads to tension when Cleo refuses to go near the water. Kim abuses the fact that her father is happy in order to get lots of gifts. Will's sister Sophie competes with Bella to get the job Bella wanted at Rikki's Cafe.