Regular Show — Season 4
01 Exit 9B
Oct 1, 201222m★ 9.0
Mordecai and Rigby must save the park after the rest of the gang are brainwashed.
02 Starter Pack
Oct 8, 201211m★ 7.6
Mordecai and Rigby want to stop Muscle Man from screwing with Thomas.
03 Terror Tales of the Park II
Oct 15, 201211m★ 8.2
While on their drive to a Halloween party, Mordecai and Rigby tells scary stories to Benson, Pops, Skips, Muscle Man, High Five Ghost and Thomas.
04 Pie Contest
Oct 22, 201211m★ 8.2
Mordecai and Rigby want to prove to Benson that they can be judges at the pie contest.
05 150 Piece Kit
Oct 29, 201211m★ 9.1
Benson wants to prove that he performed a famous drum solo.
06 Bald Spot
Nov 12, 201211m★ 6.3
Muscle Man wants to hide his bald spot at all costs.
07 Guy's Night
Nov 19, 201211m★ 8.2
Pops wants to beat the milk challenge to prove he’s one of the guys.
08 One Pull Up
Nov 26, 201211m★ 8.3
Rigby has never been known for his upper-body strength, so when the park employees have to go into the doctor and get their physicals, Rigby has trouble doing even one pull up, and so he must find a way to do so or get fired.
09 The Christmas Special
Dec 3, 201222m★ 8.0
The house is decorated, the guests have arrived and it seems like it's the season to save Christmas when the gang finds themselves faced with the task of destroying a present for Santa that has the potential to destroy them and the holiday.
10 T.G.I. Tuesday
Jan 7, 201311m★ 8.5
It’s Margaret’s last night of freedom before she transfers to a new college. So Mordecai, Rigby and Eileen decide to surprise her with the biggest party of her life. What could possibly go wrong?
11 Firework Run
Jan 14, 201311m★ 7.6
After Mordecai, Rigby and Muscle Man squander the fireworks that Benson had purchased for an upcoming event at the park, the three have to go and find more to replace them before Benson blows a fuse and they lose their jobs.
12 The Longest Weekend
Jan 21, 201311m★ 6.8
Muscle Man tries not to contact Starla for an entire weekend.
13 Sandwich of Death
Jan 28, 201311m★ 8.7
Benson eats a magical, deadly sandwich that Mordecai and Rigby bought, so the trio must travel with the restaurant's manager, Sensei, to find the cure.
14 Ace Balthazar Lives
Feb 4, 201311m★ 7.0
Mordecai and Rigby want to reunite the band Adrenaline.
15 Do or Diaper
Feb 11, 201311m★ 8.6
Muscle Man, Rigby and Starla are annoyed about Mordecai's awkward goodbye to Margaret so they try to get Mordecai to tell Margaret how he feels about her.
16 Quips
Feb 18, 201311m★ 6.8
Skips intervenes to stop his cousin's bad jokes.
17 Caveman
Feb 25, 201311m★ 7.1
When Mordecai and Rigby meet a caveman, they decide to put his unique prehistoric physique to good use: chugging cheese! But could this caveman actually turn out to be a Neanderthal nuisance?
18 That's My Television
Mar 4, 201311m★ 7.7
Mordecai and Rigby help their favorite '80s sitcom star, RGB2, escape from the studio lot and into the mountains so he can avoid starring in a revival of his show.
19 A Bunch of Full Grown Geese
Mar 25, 201311m★ 8.2
Mordecai and Rigby have to get rid of some geese that are causing problems at the park.
20 Fool Me Twice
Apr 1, 201311m★ 7.5
Mordecai and Rigby want to win the grand prize on a Japanese game show.
21 Limousine Lunchtime
Apr 8, 201311m★ 7.6
Rigby stains Mr. Maellard's expensive white limousine with a meatball sub, so the guys have to clean it before Mr. Maellard gets back from vacation.
22 Picking Up Margaret
Apr 15, 201311m★ 8.3
Mordecai offers Margaret a ride to the airport.
23 K.I.L.I.T. Radio
Apr 22, 201311m★ 8.1
Muscle Man wants a local radio station to play the song he wrote for Starla.
24 Carter and Briggs
May 6, 201311m★ 7.2
The guys enter a donut contest in hopes of winning a cameo on their favorite cop show.
25 Skips' Stress
May 13, 201311m★ 8.0
Skips has to lower his stress for health reasons.
26 Cool Cubed
May 20, 201311m★ 7.0
Thomas must save his brain after he chugs a slushy that freezes his brain.
27 Trailer Trashed
May 27, 201311m★ 6.8
Muscle Man tries to save his trailer after it fails a health inspection.
28 Meteor Moves
Jun 10, 201311m★ 8.7
Mordecai plans to kiss Margaret at a meteor shower.
29 Family BBQ
Jun 17, 201311m★ 7.6
Mordecai tries to shake hands with Margaret's father.
30 The Last LaserDisc Player
Jun 24, 201311m★ 7.9
The guys need to obtain a LaserDisc player in order to watch the director's cut of a cult classic.
31 Country Club
Jul 1, 201311m★ 6.9
Mordecai and Rigby have to rescue the golf cart from a bunch of rich people at a country club.
32 Blind Trust
Jul 15, 201311m★ 7.3
Benson must trust Mordecai and Rigby to help get him down a mountain.
33 World's Best Boss
Jul 15, 201311m★ 7.9
The park employees want to give Benson a special mug.
34 Last Meal
Jul 22, 201311m★ 6.4
Muscle Man wants to binge on his favorite foods before going on a diet.
35 Sleep Fighter
Jul 29, 201311m★ 7.1
The park guys must help Muscle Man to stop fighting in his sleep.
36 Party Re-Pete
Aug 5, 201311m★ 8.0
Mordecai and Rigby must save Benson from an evil party company.
37 Steak Me Amadeus
Aug 12, 201311m★ 9.0
Mordecai wants to ask Margaret to be his girlfriend.