The Grim Adventures of Billy and Mandy
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SEASON 3 • EPISODE 8

The Grim Adventures of Billy and Mandy

"Which Came First? / Substitute Teacher"

Date Aired: Jul 30, 2004

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Which Came First? - While going to a school excursion, Billy and Mandy's schoolbus breaks down in the middle of a desert. They, later, eventually learn that mutant chickens created in an underground lab during the Cold War lurk around. Substitute Teacher
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