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This article is about the episode. For the character, see Don.

"Don" is the tenth episode in season one of Regular Show. It first aired on November 8, 2010.


Rigby's taller, younger brother shows up at the park to fix an audit.


Mordecai and Rigby are pretending they are playing football, when Benson yells at them to go outside for an emergency meeting. Benson says that the park is being audited because Pops tried to pay the park's taxes with lollipops instead of paying with actual money. He also says that if they don't take care of this, the government will take their stuff away, and asks someone who can help them. After supposedly firing Muscle Man, having gotten sick of his "My Mom" jokes, Mordecai offers a suggestion; Rigby's accountant brother, Don. Rigby does not like this idea because he's hated Don ever since his sixth birthday party, when Don stole the attention of Rigby's friends. Despite Rigby's objections, Mordecai brings Don to the park, where he immediately takes the attention from everybody because he is cool, nice, funny, and the total opposite of Rigby, and also because he gives a hug/hand-shake, which he calls "sugar." Rigby's hatred for Don however grows, and it goes far enough that he mocks Don and throws a football in Mordecai's stomach when he was shown hanging out with Don.

Eventually, when Don is almost finished with the taxes, Rigby then drives Don away by saying that Don should never have been born. Mordecai finds out and tells Rigby to bring Don back, but Rigby refuses to and says he can finish the audit by himself; however, he does it wrong and the park begins to magically disappear by the audit. Benson orders Rigby to bring Don back, but Rigby's frustration is too strong and he runs away.

Mordecai finds Rigby in their bedroom, he berates him for his selfishness and wants him to end this. Rigby denies and blames him for not knowing what it's like to have a brother. Mordecai knows it's true, he doesn't have a brother, but he knows what it's like because he has Rigby like a brother; that despite how awkward and embarrassing he can be, he can at least make due with him. Rigby realizes his friend is right and goes with Mordecai to Don's house, but Don is too sad to go back and questions why Rigby hates him. Mordecai tells him it's because he ruined Rigby's sixth birthday, but Rigby explains that it's not just that, it's everything; he's felt overshadowed by his brother; that whenever Don was around Rigby was left out; that everything Don does is better; and that everyone believes Don is the older brother when in reality, Rigby is the older brother. After looking back and recognizing this, Don apologizes and explains he was never trying to steal his brother's thunder, he was just trying to be like Rigby, because he believed everything Rigby did was so cool.

Following this reconciliation, they go back to the park in order to stop the audit. Don is almost finished with the audit, but says that Rigby still needs to give him some sugar, so Rigby reluctantly does so under pressure. The park is restored to normal, and Don says good-bye, saying "an accountant's work is never done." Rigby and Don are now on better terms with each other.


Don credits




  • This is the first time a member of one of the main character's families makes an appearance in the show.
  • This episode reveals that Mordecai and Rigby have been friends since they were kids.
  • There is a running gag where Rigby mispronounces the word "audit".
  • The Part where Benson tells rigby to go give Don sugar has became an audio on tiktok in 2024

Episode Connections[]

  • Don later reappears to help Rigby with his basketball skills. (TV: Bank Shot). After this, he makes semi-regular appearances throughout the show, and is present when the Park returns to Earth after 3 years in space. (TV: A Regular Epic Final Battle)

Production Notes[]

  • This episode received 2.085 million views worldwide.


  • When Mordecai and Rigby are playing football at the beginning of the episode, Mordecai throws a ball of white socks at Rigby, but when Benson arrives, the socks are colored.
  • In Don's flashback in the playground, the number of stripes on Rigby's tail changes from 5 to 6 within the same flashback
  • Despite Muscle Man being fired in this episode, he is shown to still have his job in all following episodes.

Alternate Versions[]


  • Rigby's line, "I don't want your freaking sugar!" was changed to "I don't want your stupid sugar!"
  • Both Mordecai and Rigby saying "Crap!" was changed to "Crud!".