He is assigned to protect Dr. Jan Steffanic (Carl Esmond), a recent Soviet defector who has developed a new weapon which fires spores that upon contact with skin slowly eat the body away.

During their time at this house Chance falls for Steffanic's niece Ava Vestok (Barbara Bouchet), who is later revealed to be a communist spy.

Chance eventually rides in and a gun fight ensues in which Steffanic (spelled “Stefanik” on-screen) is exposed to the deadly spores in a valiant sacrifice, and dies.

Howard Thompson of The New York Times called it an "anemic James Bond imitation".

This is also Patrick Brantseg's first episode as Gypsy due to Jim Mallon's focus on directing.