Impressed by Fred's physical strength, movie producer Go-Go Ravine hires him to play "Hercurock" in a new movie. After braving pterodactyls, charging mastodons, and a three-headed brontosaurus, though, Fred retires back to the safety of his day job at the rock quarry.
| Name | Type | Role | |
|---|---|---|---|
| Alan Reed | Guest Star | ||
| Mel Blanc | Guest Star | ||
| Gerry Johnson | Guest Star | ||
| Jean Vander Pyl | Guest Star | ||
| Mike Road | Guest Star | ||
| Don Messick | Guest Star | ||
| William Hanna | Director | ||
| Joseph Barbera | Director |