|Season 7, Episode 21|
|Premiere date:|| March 19, 2016 (TV)
February 13, 2016 (Cartoon Network app)
"Donut Factory Holiday"
"Guys Night 2"
"Gymblonski" is the twenty-first episode of Season 7 of Regular Show (and two hundred and second overall) It was made available on The Cartoon Network app on February 13, 2016, and it aired on TV on March 19, 2016.
Rigby's high school nemesis returns and threatens to ruin his chances at passing gym class and graduating high school.
The episode begins with Mordecai dropping Rigby off at school. Meanwhile Rigby checks the past classes like a science and a foreign language now all that's left is a phys ed class and once he passes the class he'll finally be able to graduate high school. Mordecai asks him why he didn't pass it the first time because Rigby said that high school was a long time ago. Sometime later, Principal Dean announces that Coach McCrackle will no longer be teaching gym class. Suddenly Principal Dean reads the letter that says the things are finally looking up for him and now that he's a rich man he'll never have to spend another second in that filthy gym with their pimply greasey faces again. At the end of his letter, Principal Dean says that they found a substitute for the rest of the school year welcoming back former student and 5 time volleyball champion coach Francis Jablonski.
- Principal Dean
- Francis Jablonski
- Aiden Jablonski
- West Anderson High Students
- Gum Girl
- Cheezer's Cashier
- Cheezer's Worker
- Dirty Businessman
- Dirty People
- Coach McCrackle (mentioned)
- Rigby and Jablonski's high school rivalry is brought to an end.
- When High School Rigby is knocked down by the dodge ball in the flashback, his hair underneath his hat is styled the way it is currently, and the hair that wasn't covered by the hat is still blonde