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Jimmy Neutron's goofy pal, Sheen Estevez accidentally gets himself sent to another planet, millions of light-years from Earth.
Sheen launches himself into outer space and crash lands on the planet Zeenu. The Emperor and his daughter Oom takes an instant liking to Sheen but the Supreme Royal Adviser Dorkus wants to get rid of him after he destroys his house and usurps his influence over the Emperor. In the meantime Sheen meets Mr. Nesmith, a lost space monkey from Earth and a native Zeenuian Sheen takes a liking to, Aseefa.
The Emperor hires a tutor for Sheen to prepare him for a visit from Boh-Rok the Destroyer.
Sheen moves across the street from Dorkus.
When Aseefa's pet Chocktow goes missing, Sheen volunteers himself, Nesmith and Doppy to help her find him.
Princess Oom forces Sheen to face her ex-boyfriend in a battle for her affections, much to the reluctance of Sheen.
After Sheen entertains the Emperor with his amazing joint cracking ability, he convinces the Emperor to record his “amazing” achievements. In a fit of jealousy, Dorkus enlists the help of the Gronze brothers who accepts Sheen's challenge of being the best.
When Sheen grows tired of Zeenuian food, he searches out a lost crumb of tortilla from his spaceship. He plants it in the ground in hopes of growing some Earth food, but thanks to Dorkus, things go awry.
When Sheen experiences a Zeenu holiday, he regales the Zeenuians of tales of Earth holidays and convinces them to celebrate Thanksgetting which entails Sheen receiving gifts.
After Princess Oom is scared by Aseefa's warrior face, she convinces the Emperor to lock up all the citizens with “scary” faces, but Sheen must step in.
After the Emperor refuses to give out an acting award because Zeenuians acting is terrible, Sheen brags about how good of a tree actor he is. Dorkus overhears Sheen and creates a play where the final act will eliminate Sheen permanently.
After Sheen sees the Emperor's money suit, he decides he must make some cash to obtain his own but realizes it comes at a high cost.
Sheen realizes he no longer needs Ultra Lord.
After the Emperor's pet, Beebaw, goes missing and Nesmith is accused, Sheen convinces the Emperor to hold a trial.
While pet-sitting, Sheen accidentally gets Aseefa's pet Chocktow caught by Animal Control and has to rescue him before she returns.
In an attempt to stop Princess Oom from liking and licking him, Sheen tries to get her back together with her ex-boyfriend.
The Emperor's Royal Ball of Compliments quickly turns into a Hall of Insults as Sheen and his friends are plagued by a flock of bird-like, rowdy, mocking blurgs.
Sheen puts on a magic show that actually makes people disappear.
Sheen helps Doppy's parents rid their house of an unwanted guest.
Sheen has to rescue Nesmith from a mythical white-haired creature, the Boopenfoofer.
Sheen's starts a new art movement only to have it take over his life.
