While Billy was trying to dig his way to the Earth's core, he stumbles upon a frozen caveman. It's Fred Flintstone! Grim and Billy thawed him out of the ice. Grim wants to reap Fred's soul, but Billy wants to keep him as a friend. At school, he presented the caveman to the class. Then Fred goes crazy and kidnaps Mrs. Butterbean.
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The Grim Adventures of Billy and Mandy - 6x06 Modern Primitives
- Poor
- Nothing special
- Worth watching
- Pretty cool
- Awesome
- Aired Jan 27, 2006
- Episode 6x06
- Show special No
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