It was originally intended that this film would act as the television pilot for a new spy series. However, it was later decided that it should be given a theatrical release instead.
Following Dr Steffanic's arrival in the US he is taken into protective custody by H.A.R.M. and is placed in a beach house along with his niece and Agent Chance to develop a spore antidote. Here he reveals the communists' real plan, which is to dust all of the American crops with these deadly spores. 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. After the flat is attacked, Dr Steffanic is kidnapped by European spies and taken to a warehouse. Chance eventually rides in and a gun fight ensues in which Steffanic is exposed to the deadly spores in a valiant sacrifice, and dies.
| Actor | Role |
|---|---|
| Peter Mark Richman | Adam Chance |
| Carl Esmond | Professor Janos Steffanic |
| Barbara Bouchet | Ava Vestok |
| Martin Kosleck | Basil Malko |
| Wendell Corey | Jim Graff |
| Robert Quarry | Borg |
| Rafael Campos | Luis |
| Aliza Gur | Mid-Eastern contact |
| Donna Michelle | Marian |
| Marc Snegoff | Conrad |
| Chris Anders | Schloss |
| Steve Stevens | Billy |
| Horst Ebersberg | Helgar |
| Ray Dannis | Henry Manson |
| Robert Donner | Morgue attendant |