100th Episode Celebration is episode 100 of Comedy World. It premiered on Kids' WB on April 10, 2004.
As the great-great grandson of the founder of Lakeside City turns 100 years old, Lakeside City gets attacked by aliens shaped like the number 100!
- Andrew Rannells as PC Guy and B. Roadcast
- Josh Peck as Eric
- Dan Green as Dallas
- Tom Kenny as David, Paul, Skipper, and Walt Walker
- Carlos Alazraqui as Joey
- Billy West as Sebastian
- Gary Sauls as Constantinos
- Veronica Taylor as Carver
- Mike Pollock as Principal Walker
- Dee Bradley Baker as Wi Tu Lo
- John DiMaggio as Tony