The Grim Adventures of Billy and Mandy - Season 3 Episode 16 Which Came First?
While going to a science museum, Billy and Mandy's school bus breaks down in the middle of the desert. After digging for fossils, Billy, Mandy and Grim wander around and find an abandoned mine, where Billy is captured by a giant, mutant chicken. When Mandy and Grim go to rescue him, they find an underground laboratory from the days of the Cold War where mutant chickens were created. The mountain makes eruption, the chickens are roasted by lava, and the whole class obtains food so they do not have to resort to cannibalism.
- Genre: Animation, Comedy, Kids
- Studio: Cartoon Network
- Keyword: grim reaper, spin off
- Cast: Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall
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