Fred and Barney are suddenly thrust into an international spy plot involving a mysterious stranger who passes them an envelope, then beautiful spy Madame Yes, and Dr. Sinister, a villain who seeks world power. The two escape the villains and their nefarious plot, but once home, their wives refuse to believe the wild tale.
| Name | Type | Role | |
|---|---|---|---|
| Gerry Johnson | Guest Star | ||
| Doug Young | Guest Star | ||
| Don Messick | Guest Star | ||
| Mel Blanc | Guest Star | ||
| Jean Vander Pyl | Guest Star | ||
| William Hanna | Director | ||
| Joseph Barbera | Director |