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Teenager Jimmy Roberts had a brain transplant and ended up with famous cartoonist Milt Appleday's frozen brain full of animated characters. Jimmy sees all the characters in his everyday life and his best friend Craig's older sister Robin is a huge Appleday fan and the prettiest girl in school. There's just one problem ... Milt's son Sonny is trying to steal the brain back to pass the art off as his own.
Jimmy offends his cartoon friend, Tux, after he refuses to use the penguin's jokes in a school talent show.
An evil principal obsessed with spitballs drives a wedge between Jimmy and Craig's friendship, and threatens to kick Robin out of school. Meanwhile, Crocco shocks Golly when he tells him he's not his best friend.
Jimmy becomes the school mascot by assuming Crocco's look, but it soon changes his behavior. Elsewhere, Yancy spends a day at work with her mom.
In the Halloween-themed episode Jimmy thinks he sees ghosts in an attic classroom, which Craig spots as a moneymaking opportunity. Elsewhere, Sonny hatches a new plan to get into Jimmy's brain.
Jimmy and Robin skip school to ride a rollercoaster. Also, Sonny creates a robot version of Jimmy.
A bully with a secret lair targets Jimmy and tries to steal Robin. Elsewhere, Sonny snatches a baseball player's brain.
A reporter for the school newspaper does a story on Jimmy, but she's secretly investigating Craig and his bootleg soda operation. Elsewhere, Yancy gives Sonny romantic advice.
Dolly teaches Jimmy to skate on a cartoon island and Sonny gets a new job.
Yancy holds a boy-bashing sleepover, which upsets Jimmy after Robin shows up. Elsewhere, Jimmy's dad takes a space joyride and Dolly loses touch with her feminine side.
Jimmy and Craig have to get out of detention to prevent Robin from finding out Jimmy's most embarrassing secret.
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