3x1 – Episode 1
Benson tries to get back Mordecai and Rigby's stick hockey table when he wrongfully gives it away.
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3x2 – Episode 2
While playing a video game, Mordecai and Rigby make a bet in which the loser of the game has to wear the hairstyle of their game character. Rigby cheats to win the bet and Mordecai is forced to wear a blonde hairstyle.
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3x3 – Episode 3
When the park's bowling team, "The Park Strikers" make it to the championship match in a bowling tournament, Death, the lead member of the rival championship team threatens to reveal Skips' secret if he does not back out.
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3x4 – Episode 4
The gang sits around trying to tell the scariest Halloween story.
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3x5 – Episode 5
Mordecai and Rigby take Margaret and Eileen to a secret camping spot to show them how great camping is.
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3x6 – Episode 6
Mordecai and Rigby challenge Muscleman and High-Five Ghost to a game of basketball for computer rights and so Mordecai can make Margaret a website.
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3x7 – Episode 7
Mordecai and Rigby try to get Benson to admit they are cool when he bans them from using the cart.
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3x8 – Episode 8
Mordecai and Rigby try to live on their own when they get tired of Benson's excessive house rules.
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3x9 – Episode 9
When a skilled rap group know as "CrewCrew" insult Pops and his poems, Mordecai and Rigby join with him when he challenges them to a rap battle.
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3x10 – Episode 10
The guys try to get a girl's phone number in order to win a bet with Margaret and Eileen.
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3x11 – Episode 11
Mordecai and Rigby try to find the man who sprayed graffiti on the bathroom wall when they wrongfully accuse Muscle Man and get him fired.
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3x12 – Episode 12
When Mordecai and Rigby accidentally knock Benson unconscious, they try to make it seem like it was a dream by dropping him off at his apartment, but end up taking him to his neighbors party to help him impress her.
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3x13 – Episode 13
Benson takes the gang to a Chinese Restaurant on a count of his streak of good luck. But when Rigby switches his fortune with Benson's, he gives his bad luck to Benson.
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3x14 – Episode 14
Pops threatens to fire Benson if he does not stop yelling at Mordecai and Rigby.
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3x15 – Episode 15
Skips tries to learn how to use a computer when Mordecai and Rigby need him to fix Error 220, a virus that as infected the house computer.
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3x16 – Episode 16
Mordecai accidentally pocket dials Margaret on his cell phone, and he has to erase the embarrassing message he left on her voicemail.
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3x17 – Episode 17
Mordecai wants to win a hat for Rigby by eating a huge omelet.
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3x18 – Episode 18
Muscle Man wants to be appreciated at the park so he threatens to leave and take a job as a gut model.
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3x19 – Episode 19
Mordecai and Skips decide to work together to win the grand prize in a video game tournament. When Rigby finds out Mordecai chose Skips instead of him, his feelings are hurt.
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3x20 – Episode 20
Mordecai and Rigby have to tell Muscle Man that the million dollar scratcher ticket they gave him for his birthday is a fake without getting killed for it.
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3x21 – Episode 21
Mordecai and Rigby try to outfox Benson using holograms so that they can eat the best burgers in the world.
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3x22 – Episode 22
When Benson tries out an ostrich and a possum as replacements for Mordecai and Rigby, they have to fight for their jobs.
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3x23 – Episode 23
Rigby changes his name and has to change it back when he realizes that he picked the stupidest name ever... "Trash Boat."
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3x24 – Episode 24
Mordecai and Rigby have to do Skips' work for the day when he cashes-in a coupon that they gave to him on his birthday.
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3x25 – Episode 25
Mordecai thinks that Margaret is engaged, and he wants to find a girlfriend as soon as possible to try and get over her.
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3x26 – Episode 26
Mordecai and Rigby bust up the cart and have to go on a road trip with Benson to the dealership before the warranty expires.
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3x27 – Episode 27
Death will spare Muscle Man's life if Mordecai and Rigby babysit his kid and have him asleep before he returns.
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3x28 – Episode 28
Margaret and Eileen invite Mordecai and Rigby to a club, but they are denied entrance because their clothes aren't good enough.
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3x29 – Episode 29
After Muscleman's father dies, Benson asks Mordecai and Rigby to help him get to the Trucker Hall of Fame to spread his Dad's trucker hat ashes.
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3x30 – Episode 30
When the golf cart owned by the Park goes out of commission, Benson orders Mordecai and Rigby to throw it away. But before throwing it away, the cart comes to life asking them for one more day alive.
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3x31 – Episode 31
Muscleman has to learn proper mealtime etiquette when he decides to take Starla and her parents to a fancy restaurant to impress them.
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3x32 – Episode 32
Have you ever read someone's diary? Well has that diary released a giant guardian that wants to destroy you if you don't tell a deep secret? Mordecai, Rigby, and Skips does when Margaret asks if Mordecai and Rigby will water her plants they destroy her diary. But when Skips helps them a little peek from Rigby releases a giant Margaret guardian which they can only stop by like I said a deep secret. Will they reveal a secret or be destroyed by Margaret's diary?
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3x33 – Episode 33
Mordecai and Rigby have to return an overdue VHS to the store so they won't be banned from renting new movies.
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3x34 – Episode 34
Muscle Man vows to never prank again when one of his pranks injures Pops. A rivalry park takes this opportunity to attack the park with pranks of all kinds. The only way the park can be saved is if Muscle Man decides to prank again.
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3x35 – Episode 35
Rigby challenges Mordecai to get a picture inside Death Bear's cage at the abandoned zoo to prove that he isn't afraid of the old folklore.
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3x36 – Episode 36
The gang tries to win a pair of fuzzy dice for Pops' Birthday. But its not for sale and it is only located in a smelly, greasy arcade known as the "Fun-Fun Zone".
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3x37 – Episode 37
When Mordecai and Rigby are given the task of getting donuts for the morning meeting, they buy dangerously double-glazed apple fritters, which Pops eats and becomes high on sugar.
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3x38 – Episode 38
After getting fired by Benson, Rigby goes into the mentor program and Muscle man turns out to be his mentor, things don't go to plan.
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3x39 – Episode 39
Mordecai tries to fix his bad kiss with Margaret by using Rigby's time machine.
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