After failing his annual physical, Fred wants to prove to everyone that he is in shape, so he decides to become the first citizen of Bedrock to enter the Rockstone Marathon.
| Actor | Role |
|---|---|
 Henry CordenFred Flintstone (voice) | Fred Flintstone (voice) |
 Mel BlancBarney Rubble (voice) | Barney Rubble (voice) |
 Jean Vander PylWilma Flintstone / Pebbles Flintstone (voice) | Wilma Flintstone / Pebbles Flintstone (voice) |
 Gay AuttersonBetty Rubble (voice) | Betty Rubble (voice) |
 John StephensonFrank Frankenstone / Mr. Slate (voice) | Frank Frankenstone / Mr. Slate (voice) |
| WWayne Morton(voice) | (voice) |
 Frank WelkerDino (voice) | Dino (voice) |