While at the World's Fair, the Flintstones and the Rubbles laughingly step into a time machine, which they believe to be a hoax. But before long, they are transported to Ancient (but to them, future) Rome, Arthurian England, on board the ship of Christopher Columbus, and to Colonial America to meet Ben Franklin.
| Name | Type | Role | |
|---|---|---|---|
| Samuel Bobrick | Writer | ||
| Bill Idelson | Writer | ||
| Henry Corden | Guest Star | ||
| Gerry Johnson | Guest Star | ||
| Mel Blanc | Guest Star | ||
| Don Messick | Guest Star | ||
| Jean Vander Pyl | Guest Star | ||
| Howard Morris | Guest Star | ||
| John Stephenson | Guest Star | ||
| Joseph Barbera | Director | ||
| William Hanna | Director |