A rocket launch which releases a damaging spore into the Soviet grain belt is traced back to the US. Illya Kuryakin is made to return home to Russia, who threaten to retaliate, so Napoleon Solo is forced to search alone for the group of scientists who are trying to start World War III.
| Name | Type | Role | |
|---|---|---|---|
| Henry Sharp | Writer | ||
| John W. Bloch | Writer | ||
| Ed McCready | Guest Star | ||
| Pamela McMyler | Guest Star | ||
| Henry Jones | Guest Star | ||
| Jeremy Slate | Guest Star | ||
| Alexander Lockwood | Guest Star | ||
| Marta Kristen | Guest Star | ||
| John Harding | Guest Star | ||
| John Banner | Guest Star | ||
| Regis Parton | Guest Star | ||
| May Heatherly | Guest Star | ||
| Robert Random | Guest Star | ||
| Vincent McEveety | Director |