A new intern named Thomas the Goat gets hired to work at the park for college credit — right in the middle of an epic battle between the main characters and nearly all the enemies they made in the series so far.
Tropes:
- Armor-Piercing Question: What finally gets Skips to snap out of his brainwashed state is when Rigby asks him about the woman he loved many years ago. In fact, this is the same tactic the other Park members use to get the others back on track as well, except for High-Five Ghost and Benson.
- Big Bad: Garrett Bobby Ferguson Jr., the contractor who took over the park in order to build Exit 9B on top of it.
- Big Damn Heroes: When it seems as if the revived, vengeful enemies of the Park workers are about to kill them as they lay helpless buried in cement, a certain light shines behind them. It is a group involving Death, Gary, the Eternal Youth Babies, the God of Basketball, the Baby Ducks, and Techmo, whom are all allies of the Park workers. They free them from the cement, and aid them in battling GFB Jr.'s forces.
- Big "NO!": Yelled two consecutive times by both GBF Sr. and Jr. after Thomas signed the contract, and GBF Jr.'s Last Words after his plan failed and disappointing his father.
- Brainwashed: Garrett Bobby Ferguson Jr. does this to the park guys, and with Benson and Skips it dips into Brainwashed and Crazy.
- Brainwashed and Crazy: Skips tries to choke Mordecai and Rigby while brainwashed, and Benson attacks the duo with an excavator. Thankfully, the former comes to his senses after the duo remind him of the only woman he ever loved, and the latter comes to his senses after the duo start turning donuts with the cart, Rigby saying "hamboning", saying "Not setting up the chairs next time!" And "hmm hmm hmm hmm hmm", and finally, their "Woooooooaaaaaaahhhhh" catchphrase.
- Call-Back: And Mythology Gags, too!
- Chaste Toons: Garrett Bobby Ferguson's son GBF Jr. It's unclear to whether the son is illegitimate, conceived before divorce, a clone, or a product of a bizarre, asexual reproduction that only this show could devise (knowing this show, it's probably the latter).
- Chekhov's Gun: The secret that Skips told Mordecai and Rigby back in "Diary" is put to use here as the way Skips is freed from his brainwashing.
- The Dog Bites Back: When all seems lost, Thomas finally grows a pair and throws GBF Jr.'s coffee in his face.
- Earn Your Happy Ending: After everything they went through, the park crew finally manages to get rid of Garrett Bobby Ferguson Jr. and the other villains, the park is saved and Thomas is welcomed as a new member.
- Forgotten First Meeting: In the beginning, after GBF Jr. has brainwashed them, the rest of the Park workers except Mordecai and Rigby end up meeting one of the other and not remembering each other.
- Pops meets Skips in order to get a tire of his fixed.
- Muscle Man is almost run over by Pops after he gets his ride back and is driving, and he angrily tells him that he'll found out where he lives as he drives off.
- Then Hi-Five Ghost shows up as a pizza delivery man, wanting to know where the Park is. Muscle Man rebuffs him, telling him he doesn't have time for that, and is late for a quantum mechanics lecture, much to Hi-Five's annoyance.
- When Hi-Five actually gets to the Park, he meets Benson, who says he's not the usual pizza man, and his reply is that he's new.
- Get A Hold Of Yourself Man: While trying to get a brainwashed Skips to remember him and Mordecai, Rigby tries literally slapping some sense into him across the face. This just makes Skips go ballistic, pin the two to the wall, and almost choke them to death until they remind him of the only woman he ever loved.
- Gondor Calls for Aid: Just as GBF Sr. and other villains are revived, Skips summons Gary, Death, Techmo, the God of Basketball and the Guardians of Eternal Youth to the park crew.
- "I Know You're in There Somewhere" Fight: While almost all of the park workers have triggers that instantly snap them back to their senses, Benson proves problematic, as one strong trigger isn't enough to free him of GBF Jr.'s control, and he mentally tries to fight back. Mordecai and Rigby have to resort to multiple of their catchphrases before Benson finally remembers who he is.
- In Medias Res: The episode starts with the park already destroyed and everyone other than Mordecai and Rigby brainwashed.
- The Intern: Thomas
- Legion of Doom: The bad guys that got killed over the past 3 seasons all led by GBF Jr.
- My God, What Have I Done?: Skips has a brief one after he gets freed from the brainwashing and sees that he's choking Mordecai and Rigby.
- Putting the Band Back Together: Mordecai and Rigby have to find their brainwashed friends and make them remember who they are to stop Garrett Bobby Ferguson Jr. and his army.
- Railroad Plot: Garrett Bobby Ferguson Jr. is trying to build a freeway to destroy the park.
- Rousing Speech: Mordecai launch an inspiring speech to the outnumbered park crew and their allies as they prepare face off GBF and his army.Mordecai: It's not about defeating them anymore. It's about standing up to them and fighting. I for one am not just gonna hand over everything that I care about to some floating head that wants revenge on us. I'm not backing down, and I don't think you oughta back down either! Today we fight! We fight for the park!
- Villainous Breakdown: Garrett Bobby Ferguson Jr. lets out a Big "NO!" after he is defeated by Mordecai and his friends and sent along with his father into the Portal.
- Shout-Out: The junior of a previous villain opening a portal to another dimension to resurrect his father and every previous evil villain. He is stopped when the newest and youngest character helps to defeat him sucking all the villains back into the portal.
- The Teaser: The episode opens with the park employees running for their lives and being shot by GBF Jr.
