[[caption-width-right:320:Earth's ambassador to Zeenu. Be ''very'' afraid.]]

{{Spin off}} of ''WesternAnimation/TheAdventuresOfJimmyNeutron'', and the 29th [[Franchise/{{Nicktoons}} Nicktoon]] overall.

One day, Jimmy Neutron's intellectually-challenged friend Sheen Estevez sneaks into the secret lab and boards Jimmy's latest experimental rocket.

Before too long, he finds himself accidentally stranded on the planet Zeenu, four million and one lightyears away from home. There, he becomes an ambassador to the local purple-skinned Zeenuians, the Emperor of whom believes him to be a hyper-intelligent being sent from the heavens to guide them. He makes some new friends too, including Doppy--an alien who looks remarkably like his old friend Carl--and Nesmith--a highly intelligent astronaut chimp who tries to fix the rocket so he and Sheen can return home to Earth.

Unfortunately, a man named [[FailOSuckyname Dorkus Aurelius]], whose house Sheen accidentally wrecked during his crash-landing, is bent on destroying him.

Premiered alongside ''[[WesternAnimation/TuffPuppy T.U.F.F. Puppy]]'' on Creator/{{Nickelodeon}} October 2, 2010, the series was met with lackluster reception. About half of the first season was aired on Creator/{{Nickelodeon}} before they moved new episodes to be broadcast on Creator/{{Nicktoons}} only, similarly to ''WesternAnimation/BackAtTheBarnyard'' (which was produced by the same company). The last episode to be aired of the first season was released on February 15, 2013, with no likely followup, resulting in [[AbortedArc no resolution to Sheen's return to Earth]].

No connection to Creator/CharlieSheen, or whatever planet he's from. [[note]]Though Sheen the character ''is'' named after Charlie.[[/note]]

!!This series contains examples of the following tropes:

* AbhorrentAdmirer: Princess Oom towards Sheen.
* ADayInTheLimelight: You only get 1 guess on how this is to Sheen.
* AerithAndBob: Oom, Dorkus, Nesmith, and Bobb.
* AliensSpeakingEnglish: Lampshaded.
--> '''Sheen''': Wow, Zeenuian sounds ''just'' like English! ''([[BreakingTheFourthWall Slowly turning to look at screen]])'' What an incredible coincidence!
* ApesInSpace: Nesmith.
* APlanetNamedZok: Zeenu.
* ArtEvolution: The animation software used is a much bigger improvement than ''TheAdventuresOfJimmyNeutron'', is the same software as used in ''BackAtTheBarnyard'', and it shows.
* BettyAndVeronica: The hideous Oom is Betty and Aseefa is the Veronica.
* BigBad: Dorkus Aurelius
* BrainBleach: The episode ''The Oomlick Maneuver" has the wonderful line.
--> '''Sheen:''' I have seen things so horrible they will never ever go away, no matter how much I think of soap.
* TheCameo: In the first episode, after convincing himself that it's all a dream, Sheen imagines waking up on a farm - with [[BackAtTheBarnyard Otis and Pig]] walking by the window.
* CloudCuckooLand: Zeenu.
* CourtroomEpisode: "Trial By Jerry."
* DeadpanSnarker: Nesmith has his moments.
* DisappearedDad: Dorkus.
** Not only is he not seen, Dorkus does not even mention him
*** This is highly speculated that his father is either dead, was a deadbeat father who left his mother, or had done something to make his son disregard his existence.
* DisguisedInDrag: In "Joust Friends," Sheen attempts to get out of a duel. Doppy is the only one who's fooled.
* EverythingsBetterWithMonkeys: Mr. Nesmith the chimpanzee.
* EvilChancellor: Dorkus, until his royal adviser position is given to Sheen.
** Dorkus still retains his royal adviser position, he's only been demoted from being the Emperor's Top Adviser.
* {{Expy}}:
** Doppy who is Carl's {{Expy}} appeared in the pre-premiere commercials, and at the ending of the first episode, prompting Sheen to stare in [[JawDrop Jaw Dropped]] awe.
** Mr. Nesmith seems more like Jimmy Neutron's counterpart of the show.
** Dorkus and Pinter are this to King Gooboot and Ooblar.
* FailOSuckyname: The series' villain, Dorkus.
* FluffyTheTerrible: The warrior who can kill in over 107 ways, including emotionally...'''''Bobb'''''.
* FullNameBasis: In the pilot, Sheen calls Jimmy Neutron by his first and last name [[RuleOfFunny just to illustrate how dumb he is for not realising what the initials on the sticky notes stand for]].
* [[GreenSkinnedSpaceBabe Blue Skinned Space Babe]]: Aseefa.
* {{Gasshole}}: Aseefa becomes this after losing her roove in "Feeling Roovy".
* HugeSchoolgirl: Princess Oom.
* IdiotHero: Guess who.
** Doppy also goes under this category, but is mostly Sheen's sidekick.
* InterspeciesRomance: Sheen and Aseefa.
* MeaningfulName: Planet Zeenu's name [[StealthPun sure does]] [[GeniusBonus sound like]] "[[http://en.wikipedia.org/wiki/Xeno Xeno]]"
** Also, Dorkus Aurelius, who wants to become Emperor, is named after Marcus Aurelius.
*** It should be noted that Dorkus has shown zero desire to take over Zeenu as Emperor; it should also be noted that his only desire is for Sheen to be gone by any means necessary. Despite similarities, he is not Jafar.
* MissingMom: Dorkus and Princess Oom.
** Dorkus' mother is only mentioned and never appears in the show.
*** In the episode "Boy Next Dorkus"
-->'''Pinter:''' Alright, *picks a conversation starter card* if you were to go back in any time in history, when would it be?
-->'''Dorkus:''' Easy. My own birth to applaud my mother.

*** In the episode "Thanksgetting"
-->'''Dorkus:''' I hate that as a child I never got the Cloaked Avenger Action Figure with Magic Fire Breath, because my mother was all, *makes his voice higher pitched* "No! You'll burn down the house! Nyehnyehnyehnyehnyehnyeh..." It's all I ever asked for...

-->'''later in the same episode'''

-->'''Pinter:''' Ah, you see good things can happen to you when you open your heart.
-->'''Dorkus:''' Ooh...I wonder if it has the Magic Fire Breath my mother thought was "Oh so dangerous!" *he points the action figure towards his house and activates the "magic fire breath" causing his house to burn up and collapse* Oh Grock!
-->'''Pinter:''' Oh, it works...

*** In the episode "Act I Sheen I"
-->'''Dorkus:''' *walks out of his hiding place towards the group consisting of Sheen, Aseefa, the Emperor, Nesmith, and Doppy* Hello all.
-->'''Nesmith:''' *gasps* Where did you come from?
-->'''Dorkus:''' My mother...

** Princess Oom's mother, the Empress, never makes an appearance until the episode "Nightmare Sheenario" which is also the last episode she will be shown in.
*** According to Doppy, she comes out once every 365 days in order to retain her beautiful appearance.
* MyNaymeIs:
** D-O-P-P-tralalalalalalalalalala-Y. The tralalalalalas are silent, but felt.
** Bobb. Two Bs just aren't enough.
* NeverMyFault: Mr. Nesmith tends to receive this treatment from Sheen.
* OnlySaneMan: Nesmith and sometimes Dorkus.
* PottyEmergency: Sheen has one in the first episode after a long ride in a space ship.
** A whole episode is devoted to this. Tea anyone?
* PutOnABus: In an inversion, the whole supporting cast of TheAdventuresOfJimmyNeutron.
* RubberForeheadAliens
* RunningGag:
** Sheen's Uncle Miguel gets mentioned (and a picture of him is shown) quite frequently.
** Dorkus's house getting destroyed.
*** Only in the episodes where Dorkus appears and only when he is near his home.
* ShipSinking: Hey, remember Libby? Sheen doesn't seem to.
* ShoutOut: [[Creator/MichaelNesmith Mr. Nesmith]], the [[TheMonkees chimpanzee]], complete with trademark pompom hat.
** A one-off villain is named [[Franchise/{{BIONICLE}} Bohrok]] the Destroyer.
* SpinOff: Of ''WesternAnimation/TheAdventuresOfJimmyNeutron''.
* SplitPersonality: Princess Oom with her two faces.
* TalkingAnimal: Nesmith the Chimpanzee.
* ThatWasObjectionable: A few times in [[CourtroomEpisode "Trial By Jerry"]].
* VisualPun:
** [[WesternAnimation/TheAdventuresOfJimmyNeutron Carl]] wears glasses, thus making him a “four-eyes.” His {{Expy}} in this series ''actually has'' four eyes, complete with similar glasses. [[UpToEleven Behold the eight-eyed slug man.]]
** The planet, as seen during the intro, looks like the typical screwball design.