Gene Barry (Dr. Clayton Forrester), Ann Robinson (Sylvia Van Buren), Les Tremayne (General Mann), Robert Cornthwaite (Dr. Pryor), Sandro Giglio (Dr. Bilderbeck), Lewis Martin (Pastor Collins), Paul Frees (Rundfunkreporter), Vernon Rich (Colonel Heffner), Ann Codee (Dr. DuPrey), Jack Kruschen (Salvatore), Walter Sande (Sheriff), William Phipps (Wash Perry), Russ Bender (Dr. Carmichael), Henry Brandon (Polizist), Cliff Clark (Australischer Polizist), Edgar Barrier (Prof. McPherson), Paul Birch (Alonzo Hogue), Eric Alden (Mann), Carolyn Jones (Blondine), Rudy Lee (Junge), Hugh Allen (Brigadiergeneral)