Homer and the rest of the town (save Marge, Reverend Lovejoy, Flanders, Mr. Burns, Smithers, and Groundskeeper Willie) are brainwashed into joining a cult.

!! Tropes:

* ArmyOfLawyers: More like a fire station of lawyers
* AttentionDeficitOohShiny: Comes up when Homer tells the Movementarians about his short attention span, then gets distracted by a bird as soon as they attempt to explain the point of their orientaion film.
* BitingTheHandHumor: Just as Lisa comments that the family is thinking for themselves again, the family -- including Marge -- starts droning after the TV, "We are watching Creator/{{Fox}}..."
* BreadEggsBreadedEggs: Occurs in the Movementarians' orientaion film.
-->'''Film:''' When you surrender yourself to the Movementarians, you are guaranteed a perfect life of serenity and love and loving serenity! [[RattlingOffLegal Not a guarantee.]]\\
'''Moe:''' Loving serenity. It's about damn time!
* ChekhovsGag: When the kids are swayed out of the Movementarians' ways with fake hoverbikes, Ned reveals that he created the hoverbikes' humming noise with a comb and paper. Later on, [[spoiler:when the Leader's "spaceship" falls apart, it is revealed that the ship's own humming noise was provided by a comb and paper]].
* ChurchOfHappyology: The Movementarians is said to be a reference to Scientology (among other cults, but Scientology sticks out as the main target). The leader even looks like L. Ron Hubbard. It's a miracle this episode didn't cause controversy like ''WesternAnimation/SouthPark'''s "Trapped in the Closet" did, considering that NancyCartwright [[note]](the voice of Bart Simpson, Maggie Simpson [when she's not being voiced by a CelebrityVoiceActor], Nelson Muntz, Kearney Zzyzwicz, Database the nerd, Todd Flanders, and Ralph Wiggum)[[/note]] is an actual member of the Church of Scientology and that a rejected ''Simpsons'' episode exists where Lisa joins Scientology.
* CloudCuckooLander: Homer gets bored of the orientaion film and makes up his own movie. The first thing he says after the real movie ends is, "Wait! I'm confused about the movie. So the cops knew that internal affairs were setting them up?"
* {{Deprogram}}: Groundskeeper Willie tries to deprogram Homer, but ends up being convinced that the Movementarians are great.
* DespairEventHorizon: Rev. Lovejoy loses faith in his own religion when [[spoiler: the Leader's apparent spaceship is revealed]].
* TheDeterminator: The recruiters trying to convert Homer.
* GettingCrapPastTheRadar: Smithers eagerly agreeing to kneel before Mr. Burns. Considering his unrequited crush on the old man, that can be taken a lot of ways.
* ITakeOffenseToThatLastOne: One attempt to brainwash Homer has him being subjected to harsh criticism by several people at once. After gleefully agreeing with insult after hate-filled insult, Moe finally mentions Homer's armpit smell; Homer is about to object, but he gets a whiff himself and promptly changes his tune.
* {{Jerkass}}: [[TropeNamer This episode is the first time Homer uses the word]] ("Outta my way, jerkass!"), but "The City of New York vs. Homer Simpson" and "Trash of the Titans" actually show Homer's new jerkass personality. In this episode, he's just an easily-swayed idiot who likes beer (though some will argue that he is a jerkass for forcing his family into a cult, but that was only partially his fault).
* NoodleIncident: Three of them:
** Apparently, Reverend Lovejoy burned down the Springfield Church before ("I never thought I had to do this again")
** Barney's liver has once tried to escape from his body (the part where he mistook the liver Dolph threw out for his own)
** Homer fell for a timeshare scam where he bought four of them before his check bounced.
* OrganAutonomy: When Marge and the others tempt Homer with bear to break him out of his Movementarian mindset, Homer's brain and stomach fight over whether Homer would have some.
-->'''Homer's feet:''' [[NonSequitur Ooh, these poly-nylon sure are comfortable!]]
* TheQuisling: Kent Brockman, unsurprisingly.
* RealAfterAll: [[spoiler:Homer attempts to expose the leader as the fraud he is, only to find himself face to face with a working intergalactic spaceship. The leader attempts to escape in the ship, [[SubvertedTrope only for it to fall apart in the air, revealing it was not a real spaceship at all]].]]
* ShoutOut: Deciding that a catchy theme tune was the best way to convert Homer, the cult members chanted the one to ''Series/{{Batman}}'' with "Leader" instead of "Batman". Rover from ''The Prisoner'' also shows up.
** Mr. Burns' attempt at introducing himself as a god spoofs the music video for Music/MichaelJackson's ''[=HIStory=]''.
*** His attempts at creating a symbol for his religion ended up producing Kellogg's Special K and Disney's Mickey head.
** The way Groundskeeper Willie gets everyone's attention and offers his services spoof Quint's introduction in ''Film/{{Jaws}}''.
* ShownTheirWork: Many of the Movementarians' tactics and practices are taken directly from RealLife cults including Jim Jones and the People's Temple, the Heaven's Gate group, and the Church of Scientology.
* StartMyOwn: Mr. Burns attempts to create his own religion after he learns of the Movementarians' tax-exempt status.
* TooDumbToFool: Until the cult recruiters realized that's what kept them from converting Homer.
* WhatCouldHaveBeen: Originally, this episode was supposed to be about Lisa joining the Church of Scientology, but, unlike Trey Parker and Matt Stone, the ''Simpsons'' writers did not have the guts to mock them (especially since, like ''South Park'', ''TheSimpsons'' also has a Scientologist cast member: NancyCartwright), so they made The Movementarians a mix of other cults (along with The Church of Scientology) and have Homer swayed by them.