Following the discovery of a doomsday machine capable of destroying Earth, the launch of a US space mission to Venus is taken over by the military.
| Actor | Role |
|---|---|
 Bobby VanDanny | Danny |
 Ruta LeeDr. Marion Turner | Dr. Marion Turner |
 Mala PowersMaj. Georgianna Bronski | Maj. Georgianna Bronski |
 James CraigDr. Haines | Dr. Haines |
 Grant WilliamsMaj. Kurt Mason | Maj. Kurt Mason |
 Henry WilcoxonDr. Christopher Perry | Dr. Christopher Perry |
 Essie Lin ChiaGirl Spy | Girl Spy |
 Casey KasemMission Control Officer | Mission Control Officer |
| LLorri ScottLt. Katie Carlson | Lt. Katie Carlson |
 Denny MillerCol. Don Price | Col. Don Price |
 Mike Farrell1st Reporter | 1st Reporter |
| MMark BaileyMajor / Astronaut | Major / Astronaut |
 Mary MeadeWoman Reporter | Woman Reporter |
| JJohn CestareNot listed | Not listed |
| RRaymond MayoNot listed | Not listed |
| MMichael ChristianNot listed | Not listed |