Mordecai er taget til en mystisk by ved navn Fyretby, og Benson vil fyre ham, hvis ikke Rigby finder ham.

When Benson is yet again snubbed for a Parkie Award for Manager of the Year in favor of Gene the Vending Machine, the rest of the gang try to make Benson feel better with a guy's night out... after Rigby makes off with the award Gene just won.

When Rigby ruins Maellard's fancy lunch, either he or Benson must write a letter of resignation before 5:00 pm, or they'll both be fired.

Margaret auditions for the chance to host a weekly news segment by doing an undercover investigation piece. Still, a mysterious, trenchcoated informant à la Deep Throat keeps giving her bogus leads.

Benson is determined to prove he was right about the date of the "Dome Experiment," a month-long experiment in which the park workers are locked in a bio-dome. After the dome comes a day early, all signs point to a possible conspiracy over the dome's real intentions.

After overhearing Mordecai tell Skips that he gives the worst birthday presents, Rigby teams up with a video game programmer to make Mordecai the best gift ever.

When Benson threatens to blow the whistle on Mordecai and Rigby's Funny Video Fridays, the duo distracts Benson with viral videos showing cats doing cute and crazy things, turning their boss into a cat video addict.

Muscle Man and Hi-Five Ghost get struck by lightning and develop amnesia.

Benson tries to spice up the park's annual Halloween party by renting a wish-making machine.

Mordecai and Rigby want to help Party Horse get back together with his girlfriend.

After staying up for two straight nights watching a movie marathon, Mordecai and Rigby have to get their sleep cycle back on track.

Rigby and Eileen get called away to Don's black belt ceremony, forcing Mordecai and Margaret to hang out alone – and Mordecai to confront his feelings for Margaret now that he's single.

Benson gets a pet pig named Applesauce and asks Mordecai and Rigby to look after him.

Rigby goes back to high school to graduate and earn his diploma, something he keeps secret from Eileen. But Eileen becomes suspicious when Rigby repeatedly cancels their dates.

In order to get high school credits, Rigby has to pass a foreign language class taught by Benson in China.

Rigby is irate that Eileen always correctly guesses the surprise dates he plans for her, sometimes before he can even tell her. He develops an elaborate, circuitous plan involving numerous fake locations and a fake biker gang to throw her off.

Pops is chosen to appear on a game show called Win That Prize and ends up being hired to a local TV station when his ideas and appearances become popular.

Eileen, Rigby, Mordecai, and Margaret go on a snow tubing trip while Eileen tries to conquer her fear of snow tubing.

Benson wants to get some street cred with the Park Managers’ Association and win the big chili cook-off.

The guys try to return a movie before they get hit with a late fee. Still, the tape gets stuck in the VCR.

Rigby's high school nemesis returns and tries to stop him from graduating from high school by making sure he fails gym class.

Thomas reunites with the Park Crew for one last Guys Night together before he goes into hiding forever.

When Mordecai and Rigby mess around with the cables in an old synthesizer, Gary disappears, and the guys then have to find a way to bring him back.

After Rigby wins a king-size bed, he gets rid of his trampoline but quickly regrets his decision and tries to get his trampoline back.

Feeling that the park guys only care about his strength, Muscle Man decides to prove that he can be smart by working in a corporate office.

Rigby must borrow his dad's car and return it unnoticed so he can drive Eileen to his school prom.

"The Dome Experiment" is back on again, and the guys are tasked to protect a large red button.

When Mordecai, Rigby, and Hi-Five Ghost accidentally destroy Muscle Man's favorite shirt, they have to replace it before Muscle Man finds out.

Being unaware that a Renaissance Fair is being held at the park, Pops believes he has been sent back to medieval times.

Pops tries to see a planet that only passes by every 25 years.

Benson has a crush on one of the Dome scientists, and he wants to sneak her a bucket of chicken wings so that he can ask her out.

Mordecai and Rigby are put on a 24-hour lockdown inside the Dome, but they want to sneak out and see one of their favorite bands.

Mordecai, Rigby, Muscle Man, and Hi-Five Ghost want to be VIP members at Cheezer's.

The duo deals with The Dome's scientists to help them search for Benson's car keys.

Rigby must write a speech for his high school graduation that will be broadcast on national TV. Meanwhile, Mordecai sinks into a depression over how Rigby is now more successful than he is, and the park workers finally find out the true intentions of the dome experiment.