Hot Time in the Old Town

At a construction site, Gary attempts to halt the driving of a pylon into the ground, because the paper said it would cause an explosion. He is accidentally knocked unconscious and wakes up in the same location, but in the year 1871. Gary meets characters that look exactly like Chuck and Marissa, and tries to prevent Mrs. O'Leary's cow from kicking over the lamp, thereby triggering the famous Chicago fire. He fails and the fire is set anyway, but when he returns to 1998, he halts the construction and gets the manager arrested