Cartoon Network shows have never shied away from the occasional celebrity cameo. From one-off character appearances to hefty recurring roles, these celebrity appearances have made our favorite Cartoon Network shows that much more rewatchable.

Tim Curry Regular Show The Rocky Horror star voiced a psychotic sausage during an early episode of the chaotic 2009 show. Curry lent his voice to numerous animated shows and films, including a stint as Chancellor Palpatine on Star Wars: The Clone Wars. CRACKED.COM


Henry Rollins Adventure Time It's hard to count the number of celebrity cameos on Adventure Time, but punk legend Henry Rollins made an appearance as Lady Rainicorn's nerdy father Bob. Rollins also lent his voice to a few one-line background characters in the show, including a man made out of cookies. CRACKED.COM


Isaac Brock The Marvelous Misadventures of Flapjack Modest Mouse's Isaac Brock wrote music for a musical episode of the show, which also features an extended version of the theme song that includes his vocals. CRACKED.COM


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