Due to a mix-up at the doctor's office, Fred believes he has only 24 hours left to live.
| Actor | Role |
|---|---|
 Henry CordenFred Flintstone / Monkey #2 / Turtle #2 (voice) | Fred Flintstone / Monkey #2 / Turtle #2 (voice) |
 Mel BlancBarney Rubble (voice) | Barney Rubble (voice) |
 Jean Vander PylWilma Flintstone / Pebbles Flintstone / Elephant (voice) | Wilma Flintstone / Pebbles Flintstone / Elephant (voice) |
 Gay AuttersonBetty Rubble / Nurse / Turtle #1 (voice) | Betty Rubble / Nurse / Turtle #1 (voice) |
 John StephensonFrank Frankenstone / Dinosaur / Monkey #1 (voice) | Frank Frankenstone / Dinosaur / Monkey #1 (voice) |
| DDon MessickDoctor / Fish #1 / Fish #2 / Parrot / Pigasaurus (voice) | Doctor / Fish #1 / Fish #2 / Parrot / Pigasaurus (voice) |