Action Planet is a comic book print universe of Earth with a Comic Book version of Dimmsdale that was created when Timmy wished for the world to be like a comic book as he was angry that everyday heroes would not come to help him when he really needed help.
There are heroes as well as villains in this universe due to the world being like a comic book. There is a superhero school, which floats in the sky, as well as the occasional evil living building. This world was briefly a villainous world when Nega Chin tricked Timmy into unwishing the heroes, but Timmy was later able to get everything back to normal and remove the villains as well (because in the comic book world, the heroes will always triumph over evil due to the writers).
Everything in this version of Dimmsdale is presented as if the viewer were reading a comic book, right down to the print dots in the background. The world itself is shaped like a comic book with the title "Action Planet" with a picture of Earth wearing a cape. Text at the bottom of the cover reads "First Amazing Issue."
- Timmy Turner/ Cleft the Boy Chin Wonder
- Cosmo and Wanda Cosma/ Ace and Clefto the Chin-Hounds
- Chester McBadbat/ Matter Muncher Lad
- Elmer/ Bouncing Boil
- Sanjay/ The Sonic Youth
- AJ/ Professor A.J.
- Trixie Tang/ Wonder Gal
- Veronica/ Hawk Gal
- Crimson Chin
- Nega Chin
- Vicky the Babysitter/ The Baby Shredder
- Francis/ Bull-E
- Denzel Crocker/ Doctor Croctopus
- Mike the Evil Living Building