CN's Birthday Games is a bumper produced by Primal Screen (known for doing many bumpers for Cartoon Network since the Powerhouse era) that sometimes airs on Cartoon Network in special rotations.
On Cartoon Network's 20th Birthday, the cartoon characters are playing potato sack race. Finn and Jake are in competitions with Mordecai and Rigby, Fred Flintstone and Wilma, Yuki Sohma and Tohru Honda and Renge Houshakuji and Tamaki Suoh. Finn and Jake decide to use Princess Bubblegum's invention to make them accelerate.
- Jeremy Shada - Finn the Human
- John DiMaggio - Jake the Dog
- Jeff Bergman - Fred Flintstone, Mr. Slate
- JG Quintel - Mordecai
- William Salyers - Rigby
- Tress MacNeille - Wilma Flintstone
- Eric Vale - Yuki Sohma
- Laura Bailey - Tohru Honda
- Monica Riel - Renge Houshakuji
- Vic Mignogna - Tamaki Suoh
- Hynden Walch - Princess Bubblegum
- This is the first Cartoon Network production featuring four voiceover actors with names starting with the letter "J" having a main role in the special: Jeremy Shada, John DiMaggio, JG Quintel and Jeff Bergman.
- This is the first time Fruits Basket and Ouran High School Host Club have appeared in a Cartoon Network production. This is possibly because the company or Stuart Snyder has made a deal with Funimation to gain access airing rights to both shows.
- This bumper rarely aired for unknown reasons.