Season 1: 2010
This season consists of 12 episodes. It started on September 6, 2010 (with "The Power") and ended on November 22, 2010 (with "Mordecai and the Rigbys").

1. "The Power"
Rigby steals a magic keyboard from a preoccupied sorcerer. When Mordecai and Rigby accidentally make a hole in the wall while wrestling a stuffed animal, they use the keyboard to make Pops and Benson give them raises to try to pay for it. They then decide to instead use the magic keyboard to give them everything they want, though they accidentally send Skips to the Moon with it along with other random items. They must now rescue Skips, while fleeing from a monster at the same time.

Antagonist: The Moon Monster 

2. "Just Set Up the Chairs"
While preparing for a birthday party, Mordecai and Rigby are assigned to set up chairs, and the two try to get the job done to prove to Benson they are not slackers. But instead, they slack off as usual. In the process, they accidentally unleash an 8-bit demon from an old arcade game of the same name (Destroyer of Worlds) who tries to destroy the world. Meanwhile, Muscle Man and High-Five Ghost are assigned to pick up the Special Entertaiment, but soon find out the difficult way to do it when they find out the entertaiment is a talking horse and a drunken clown.

Antagonist: The Destroyer of Worlds 

3. "Caffeinated Concert Tickets"
Mordecai and Rigby work overtime in order to get tickets to a Fist Pump concert. While working, they drink lots of coffee to keep them active. When they run out of coffee, they agree to get some more with the help of a giant coffee bean and his translator (also interested in the concert), in exchange for tickets for them as well. Mordecai and Rigby buy tickets for themselves; but when they fail to buy tickets for the coffee bean and the translator, the two steal Mordecai and Rigby's tickets. Mordecai and Rigby race against them as they try to get the tickets back, and also to arrive at the concert on time.

Guest voices: Steve Little as the Giant Coffee Bean Songs: "Working for the Weekend" by Loverboy

Antagonists'Coffee Bean, The Translator 

4. "Death Punchies"
Tired of Mordecai always beating him at punchies and getting his way, Rigby decides to learn the martial art of "Death Kwon Do". He steals the instructions for the "Death Punch" and learns it, so Rigby decides to try out the move on unsuspecting people as he prepares for his revenge against Mordecai. Later, when Mordecai learns of Rigby's plan, he also decides to steal some Death Kwon Do moves in order to stop him.

Song: "You're the Best" By Joe Esposito.

Antagonist: Rigby, Death Kwon Do 

5. "Free Cake"
Mordecai and Rigby try to seize an opportunity to eat a piece of cake, and it comes when they learn that Skips’ birthday is coming soon. But on the night of his birthday, Skips secludes himself in a forest instead of going to his party. Mordecai and Rigby try to bring Skips to the party, but they interrupt him while he's doing a spiritual dance. As it turns out, Skips had made a pact with the "Guardians of Eternal Youth", who were giving Skips the gift of immortality as long as he performed the spirit dance every birthday. Now that Mordecai and Rigby had broken Skips' pact, the Guardians kidnap Skips and are about to kill him. Now, the two must rescue Skips.

Antagonist: The Guardians of Eternal Youth 

6. "Meat Your Maker"
While everyone prepares for the park’s annual barbecue, things go awry when Rigby accidentally burns Benson’s hot dogs. Mordecai and Rigby search for more hot dogs in the freezer, but Rigby accidentally traps them inside and breaks the thermostat, causing Mordecai to go unconscious. Rigby carries Mordecai's body and finds more hot dogs (that are alive), and they help them escape from the freezer. However, the talking hot dogs reveal their real intentions: to eat everyone.

Guest voices: Tim Curry as the leader of the talking hot dogs

Antagonists: Evil Hot Dogs and their leader 

7. "Grilled Cheese Deluxe"
Mordecai and Rigby are assigned to get a grilled cheese sandwich for Benson while playing a game to see who is the better liar. Mordecai and Rigby pretend to be astronauts, and they even fool a pair of real astronauts and their coworkers. However, they soon get themselves involved in a serious problem: trying to prevent a sample of antimatter at a space center laboratory from destroying the city (while pretending to be antimatter experts).

Song: "Lies" by The Thompson Twins.

Antagonists: The Astronauts 

8. "The Unicorns Have Got to Go"
Mordecai buys a new cologne to attract Margaret instead of hanging out with Rigby like he promised. But instead, the cologne attracts a gang of trouble-making unicorns. The unicorns "help" Mordecai attract Margaret, but only make him feel embarrassed so they can get a laugh out of it. At nighttime, the unicorns throw a party at the park, wrecking everything. Mordecai, Rigby, Benson, and Skips must then devise a plan to get rid of the unicorns.

Antagonists: The Gang of Unicorns 

9. "Prank Callers"
Mordecai and Rigby decide to make prank phone calls. They try to prank the Master Prank Caller numerous times, although they fail to fool him (and only make him increasingly annoyed). Eventually, he calls Mordecai and Rigby and sends them to 1982. Mordecai and Rigby must then engage in a battle of prank calls against the Master Prank Caller to send them back to the present.

Guest voice: Tim Curry as the Master Prank Caller

Antagonist: The Master Prank Caller 

10. "Don
 The park is about to be audited, with all of its property to be confiscated if the taxes are not paid. The park employees call Rigby’s brother Don, a friendly accountant, to manage the taxes. Rigby is jealous of Don, whose likable personality takes the attention away from him. Rigby turns away Don, who is saddened and leaves. Rigby then tries to manage the audit himself, but he (having no knowledge of accountancy) does it incorrectly. The audit begins and the park starts to get deleted like a computer program. It's up to Mordecai and Rigby to try and bring Don back to stop the audit.

Guest voice: Julián Rebolledo as Don

Antagonists: The Audit and The Auditor 

11. "Rigby's Body"
When Rigby eats too much junk food, his body forces out his consciousness. Rigby (now a disembodied consciousness) is aided by Mordecai and Skips as they set out on a quest to get Rigby back to his body before sunset, and also have to prevent a bodybuilder's disembodied consciousness from taking it.

Guest voice: Jeff Bennett as the bodybuilder.

Antagonist: The Bodybuilder 

12. "Mordecai and the Rigbys"
When Mordecai and Rigby order T-shirts for their non-existent band (Mordecai and the Rigbys), Margaret mistakes them for actual musicians. Mordecai, who wishes to impress Margaret, decides to go along with this misunderstanding by forming a real "Mordecai and the Rigbys" band. However, neither Mordecai nor Rigby have any idea how to play music. Later, Mordecai and Rigby's future selves (who became successful musicians) arrive. Future Mordecai and Future Rigby teach their present selves how to become musicians, but soon conflict is ignited when Present Mordecai and Present Rigby learn that they were duped into lip-syncing.

Guest voice: Paul F. Tompkins as the voice on Pops' instructional records

Antagonists: Future Mordecai and Future Rigby 

Season 2: 2010-2011Season 2 began on November 29, 2010 (with "Ello Gov'nor") and hasn't ended yet.

13. "Ello Gov'nor"
Mordecai and Rigby watch an old British horror movie, Ello Gov'nor, featuring an evil ghost taxi. Despite being a low-budgeted work of fiction, Rigby gains a paranoid fear of the evil taxi, believing he sees it everywhere he goes. Meanwhile, Mordecai tries to make Rigby overcome his fears. After a number of attempts, Mordecai and Rigby take a ride in Pops' taxi. However, the evil taxi appears out of nowhere and chases Mordecai, Rigby, and Pops. Rigby must overcome his fears to save himself and his friends.

Guest voice: Paul F. Tompkins as the video store employee

Antagonists: The Haunted British Taxi and the Movie Shack Hut Employee 

14. "It's Time"
Mordecai becomes extremely jealous when Rigby manages to get a date with Margaret. Mordecai tries to prevent Rigby from getting to his date on time by destroying all the clocks they have. This causes the two to be transported to another dimension; and along the way, Mordecai kills Rigby and soon regrets it. Now, Mordecai has to meet a being named Father Time, so that he can go back in time to set things right.

Guest voices: Alan Sklar as Father Time

Antagonists: Mordecai 

15. "Appreciation Day"
Everyone at the park except Mordecai and Rigby receive appreciation plaques, as Benson remarks that the two only "slack off and mess up". So Mordecai and Rigby decide to write false stories in Benson’s park records book to make themselves look better. The two write that they're Benson's favorite employees, that they served him pancakes, worked hard on their chores, and that they helped an inured Skips while fighting "Snowballs the Ice Monster" during a blizzard. However, Mordecai and Rigby soon realize that everything they wrote in the book becomes reality. Now, they must flee from Snowballs while trying to get Benson's book to change things back to normal.

Antagonist: Snowballs the Ice Monster 

16. "Peeps"
Enraged at Mordecai and Rigby's constant slacking, Benson orders the "Peeps" surveillance system to force them into working. But when Mordecai and Rigby keep trying to circumvent the surveillance system, Benson keeps upgrading his subscription until he mistakenly summons Peeps — a giant eyeball, who spies on everyone and scares them. Now, Mordecai challenges Peeps to a staring contest; if Mordecai wins, Peeps must leave. If Peeps wins, he will harvest everyone's eyes.

Guest voice: Richard McGonagle as Peeps

Antagonist: Peeps 

17. "Dizzy"
Mr. Maellard (Pops' father and the owner of the park) expects his son to give an important speech. However, Pops suffers from stage fright. So, Mordecai and Rigby try to help Pops. After a while, they suggest that Pops should spin around. Pops succeeds in ridding himself of his nervousness, however he becomes dizzy and falls into unconsciousness. Pops' mind enters a strange place, where it is illegal to give speeches (much to his joy). Skips then sends Mordecai and Rigby into Pops' mind. Mordecai and Rigby must then convince a reluctant Pops to wake up so he can give the speech.

Guest voice: David Ogden Stiers as Mr. Maellard

Antagonists: Iacedrom and Ybgir 

18. "My Mom"
When Mordecai and Rigby fail at another task, Benson has Muscle Man and High Five Ghost supervise them. Mordecai and Rigby hate having to put up with Mucle Man and High-Five, especially Muscle Man's "My Mom" jokes. After spending the day with them, Mordecai and Rigby decide that they are very fun to be around. Mordecai still cannot put up with Muscle Man's jokes, however, and tells him that he doesn't say the joke right. Mordecai proceeds to tell "Your Mom" jokes, and Rigby soon joins in. Muscle Man becomes infuriated and calls on his brother to teach Mordecai and Rigby a very important lesson.

Guest voices: Steven Blum as John, and Tiny Lister as Bobby Song: "Nothin' But a Good Time" by Poison.

Antagonists: Muscle Man, High-Five Ghost, and Muscle Man's Brother 

19. "High Score"
Mordecai and Rigby are fed up with the disrespect they receive, so they decide to beat two rude kids’ high scores at an arcade game (Broken Bones). But now they must compete against the game’s greatest player — Garrett Bobby Ferguson, a giant bearded face who arrives from another world to defend his high score (#1 in the universe).

Song: "Hangin' Tough" by New Kids on the Block. Note: This is the first episode to air at 8:30 PM.

Antagonist: Garret Bobby Ferguson 

20. "Rage Against the TV"
Mordecai and Rigby are about to beat "The Hammer", the supposedly unbeatable final boss in their new video game, when the TV breaks. They ask around, hoping someone will loan them another TV. Skips says he doesn't have one, Pop's "television" ends up being a simple radio, Muscle Man breaks his TV, and Benson refuses to give his to Mordecai and Rigby. Since Skips, Pops, Muscle Man, and High-Five all wish to see "The Hammer", they work together to make a working TV, using various parts from their broken sets. However, this unleashes "The Hammer" into the real world, and everyone must help to stop him.

Guest voice: Roger Craig Smith as Jimmy

Antagonist: The Hammer 

21. "Party Pete"
When Benson takes the night off, Mordecai and Rigby decide to throw a party. When it gets off on a rocky start, they seek the help of Party Pete to get their party going. But after a suspicious call to the house, Benson drives to the park to investigate. Mordecai and Rigby try to end the party, but they soon learn the hard way that Party Pete is unstoppable when drinking "RadiCola" soda.

Guest voice: Jeff Bennett as Party Pete

Antagonist: Party Pete 

22. "Brain Eraser"
Mordecai sees Pops naked and tries to forget about it. Rigby decides to help out by showing him a supernatural anime tape (Planet Chasers: Starlight Excellent). In turn, the anime tape removes Mordecai's mind and sends it into the tape. As Mordecai is now (literally) mindless, Rigby and Skips watch the tape, and they too get sent inside it. Now, they must erase Mordecai's memory of naked Pops and then save him from being inside the tape.

Guest voices: Jeff Bennett as the Movie Shack Hut worker Note: This is the first new episode on a Friday.

Antagonist: The Memory of Naked Pops 

23. "Benson Be Gone"
After Mordecai and Rigby cause one calamity too many at the park, Mr. Maellard blames Benson (believing that Benson, as park manager, must accept the blame for everything that happens). Maellard demotes Benson to work alongside Mordecai and Rigby, hiring a woman named Susan as the new manager. After Benson gets a taste of Mordecai and Rigby's lifestyle, he too becomes a slacker and promptly gets fired. However, Benson is soon disgusted by slacking, and tries to get his job back. But the situation is complicated when Susan turns out to be a high-tempered demon, who is turning the park employees into clones of herself. Now, it's up to Benson to save the day.

Guest voices: Steven Blum as Leon, April Stewart as Susan

Antagonists: Susan and her Giant 

24. "But I Have a Receipt"
Mordecai and Rigby try to return a mediocre role-playing board game (The Realm of Darthon) to a grumpy store manager. But when the manager refuses to give a refund, the duo try to retaliate by pointing out the board game's imperfections to oncoming customers. After driving out his last customer, the enraged store manager traps Mordecai and Rigby in the game and it's up to them to escape and get their refund.

Guest voice: Roger Craig Smith as the game store manager

Antagonists: The Game Store Manager and Darthon 

25. "This Is My Jam"
Rigby has an annoying song stuck in his head, much to the chagrin of him and Mordecai. Mordecai helps Rigby as they try to get the song out of his head, but find it very difficult. Eventually, Rigby takes a nap and manages to remove the song from his head; however, the song comes to life in the form of a humanoid cassette tape with eyeglass shades, and annoys everyone. Now, all the park employees unite and write their own cheesy song to try and defeat the Summertime song.

Antagonist: The Summertime Song 

26. "Muscle Woman"
Muscle Man breaks up with his girlfriend, Starla, leaving him an emotional mess and unable to work. When Mordecai and Rigby are forced to pick up Muscle Man's jobs around the park, they attempt to reunite Muscle Man and Starla, until she begins to fall for Mordecai. Mordecai, who is disgusted by this, pretends to like Starla to try and get her and Muscle Man back together. When this doesn't work, Mordecai later admits to Starla his dislike of her. As a result, she angrily chases Mordecai and Rigby, destroying half the city along the way. Only Muscle Man can stop his crazy ex-girlfriend.

Guest voice: Courtenay Taylor as Starla

Antagonist: Starla 

27. "Temp Check"
Rigby hires a temp (temporary worker), Doug the river otter, to do his work for him. However, Doug befriends Mordecai, and Rigby is jealous when Mordecai begins to hang out with Doug more than Rigby. Worse, Rigby learns Doug's secret: that he is a shapeshifting criminal, who plans to turn himself into a clone of Rigby in order to impersonate and replace him.

Guest voice: Roger Craig Smith as Doug

Antagonists: Doug the Doppleganger and Evil Rigby 

28. "Jinx"
Mordecai jinxes Rigby, punching him every time he speaks. Rigby must then figure out how to un-jinx himself without talking in the presence of Mordecai. When he cannot get anyone to help him undo the jinx (by chanting his name three times), Rigby performs a forbidden "un-jinxing" ritual: he walks into a bathroom, prints his name onto a mirror, and then chants his name three times. But instead, Rigby mistakenly releases a demonic clone of himself, named Ybgir. The demon Ybgir terrorizes the park, turning almost everyone into demons. This leaves Mordecai and Rigby to try and undo the ritual to send Ybgir back to the mirror, and turn everyone back to normal.

Note: When Rigby performs the mirror ritual and Ybgir emerges from the mirror, it is an allusion to the Bloody Mary myth.

Antagonist: Ybgir the Mirror Monster 

29. "See You There"
Muscle Man invites everyone to High Five Ghost's birthday party, except for Mordecai and Rigby. They believe this is because of an incident that morning, when Rigby was choking and Mordecai's Heimlich maneuver caused the choke wad to splash soda in Muscle Man's face. Mordecai and Rigby try to crash the party, but they are denied access. High Five Ghost's brother, Low Five Ghost, turns Mordecai and Rigby into ghosts so they can phase through the party tent. However, High Five Ghost and his father tell them that they could get stuck as ghosts, and the only way to change back is to scare someone. Mordecai and Rigby scare Muscle Man, but he suffers from a heart attack. However, Muscle Man awakens and confesses in a very shocking revelation to the party. Guest voices: Roger Craig Smith as Low Five Ghost, and Tiny Lister as Bobby

Antagonist: Muscle Man 

30. "Do Me a Solid"
Mordecai and Rigby start to do "solids" (or favors) for each other. Skips warns them of their overuse of the solids, but Mordecai and Rigby ignore him. At the cafe, Eileen (a mole-girl who is infatuated with Rigby) asks Rigby if they could double date with Mordecai and Margaret. Seeing it as an oppurtunity to be with Margaret, Mordecai begs Rigby to "do him a solid" and go out with Eileen. Rigby eventually agrees, but only if Mordecai will do ten solids for him. During the date, Rigby uses his ten solids to ruin Mordecai's chances with Margaret. The tenth solid is so humiliating that Mordecai refuses to do it. After Mordecai refuses the solid, the house begins to break apart. Mordecai must do the solid, or the house, along with its inhabitants, will be destroyed. Note: The tenth solid that Mordecai must perform is never revealed to the audience.

Antagonist: Rigby 

31. "Grave Sights"
When suggestions to raise money for the park are in need, Mordecai and Rigby option that they host a scary movie night. They decide it could be shown in the park's run-down cemetery, as it is in need of repairs. Benson agrees, and promises the duo a paid day off if the plan works. Mordecai and Rigby rent Zombocalypse 3D, 3D glasses, and a classic film reel, while everyone else sets up. Thanks to Mordecai and Rigby's advertisements, the movie night sells out. However, during a mistake in the showing of the film, the movie reel short circuits and raises the corpses in the cemetery. The audience thinks that the zombies are special effects and are oblivious to the danger. Mordecai, Rigby, Skips, Muscle Man, and High-Five Ghost must all team up to take down the zombies and keep the movie night from being ruined.

Guest voices: Sam Marin as the Movie Shack Hut manager, Jeff Bennett as the zombies, and the Zombie Hunter (the protagonist of Zombacolypse 3D)

Note: This is the first episode since "My Mom" to air at 8:15. Also there is a cameo appearence of one of the gas station workers from Quintel's student film 2 in the AM PM.

Antagonists: The Zombies and Howard Fightington 

32. "Really Real Wrestling"
Mordecai and Rigby are bummed because they do not have tickets to a wrestling championship. They pretend to wrestle each other, but Pops, not understanding the situation, begins to wrestle Mordecai for real. He reveals that he used to wrestle when he was younger, and proceeds to produce two extra tickets to the championship match. He invites Mordecai and Rigby to go, and they decide to celebrate by wrestling with Pops 'for real.' However, during the scuffle, Pops hurts his back. Benson decides that none of them can go to the match, and orders Mordecai and Rigby to watch Pops instead. The duo soon decide to sneak out, but when they get there, they are shocked to find that Pops has not only snuck out as well, but foundhis way into the wrestling ring. 

Antagonists: Four-Armageddon, Hissy Fit, The Fire Marsharl, and Huge Head. 

33. "Over the Top"
 During an employees-night out at McHooligans, Skips shows off his strength by arm-wrestling everyone. When he gets to Rigby, everyone is shocked when Rigby beats Skips. Ego bruised, Skips demands that he and Rigby have a rematch. Skips loses again. He proceeds to so slightly crazy, and even destroys Mordecai and Rigby's room, searching for "the trick" to Rigby's power. Mordecai reveals that Rigby is pranking Skips, and tells him about a device called the Playco Armbboy, which gives the user superhuman arm strength. Skips storms to McHooligans and tells Rigby he wants another rematch. This time, he rips the Armboy off of Rigby and forces Rigby to arm-wrestle for real. The result kills Rigby, and Skips must now defeat Death in an arm-wrestling contest to win Rigby's soul back. 

Antagonists: Skips and Death 

34. "The Night Owl"
Mordecai, Rigby, Muscle Man, and High-Five Ghost team up to win a car in a radio contest hosted by the Night Owl, a radio talk show host. The four must remain on a billboard catwalk longer than the other contestants. They succeed to drive everyone off of the catwalk, but the Night Owl does not want the contest to end so quickly, as he wants to become famous for it. He tricks the four of them into thinking they all want the car for themselves, and freezes them in a fighting state with nitrogen. They wake up in the distant future, and discover that the Night Owl fooled them all. Now, they must team up to escape the museum that has been built around the contest. Note: This episode is actually before Over The Top, but the airdates have changed. Also, this is High-Five Ghosts's most primary speaking appearance, unlike other episodes with brief lines.

Antagonist: The Night Owl 

35. "A Bunch of Baby Ducks"
Mordecai and Rigby find four ducklings while cleaning the park fountain. The ducks imprint on Rigby, believing him to be their mother. Benson orders them to get rid of the ducks and go back to cleaning the pond. After the ducks learn a few (very violent) moves from Rigby, the duo decide that not just anybody can have ducks as cool as them. They post advertisements, but the only one who answers is a creepy man with an apparent duck fetish. After Mordecai and Rigby turn him away, the mother duck calls them and asks for her ducklings back. Mordecai and Rigby agree to meet her, but upon going back outside, they find that the duck-fetish man has stolen the ducks. Mordecai and Rigby, along with the mother duck, must rescue the ducks from the man.

Antagonist: The Duck Collector 

36. "More Smarter"
Rigby creates a new drink, which he dubs "Rig-Juice". Mordecai insults him, leading to an argument between them about who is smarter. Mordecai boasts that he has been the smartest since Rigby dropped out of high school. Angered, Rigby tries to get a high school diploma, only to be kicked out of school altogether. He tries to apply for a diploma online, but instead finds an advertisement for a drink that gives the user an intelligence boost. He uses it to denounce Mordecai as the smarter of the duo, but after discovering Rigby's secret, Mordecai drinks the brain boosting elixer as well. They try to disprove each other as the smartest by writing equations and formulas all over the house, and taking multiple drinks from the brain boost formula. Benson comes in and tries to stop them, only to be presented with the duo speaking Latin. Mordecai and Rigby, however, see Benson and the others as caveman-like creatures that speak only in grunts. Mordecai and Rigby discover that they are now too smart for the world around them, and only Rigby's "Rig-Juice" can dumb them down to their normal selves.