The episode starts off as Jake, Trixie, and Spud in a train to go have fun on their free day of school. They decide to go to carnival; they have fun and go on rides. Jake suddenly sees a sign that says that they have a unicorn, Trixie says that it is just a horse in a custom with a horn, Spud tells thanks her for ruining the fun. When they go inside they see a person that spits fire, and then they see a unicorn, Jake notices that the unicorn is real. When they leave, Jake calls Fu Dog and he tells Jake that he has to get the unicorn back with its herd. When they go inside again, Trixie and Spud distract one of the carnies, the unicorn makes a noise and the carnies notice that the kids are trying to take the unicorn, Jake, Trixie and Spud leave with the unicorn, while Trixie and Spud take the unicorn, Jake turns dragon and distracts them. When Jake goes back for the Trixie and Spud, they are all in middle of the road, Trixie finally gets the Unicorn to move and they go really fast, they go through race horse tracks. When Jake and Trixie and Spud lose the carnies, they go to the forest where they leave the unicorn to go with its herd. The unicorn leaves and Jake apologizes about having a bad day, Trixie and Spud disagree and tell him that it was the best day ever, the episode ends on that.
- this episode title is references to 1986 science fiction Flight of the Navigator