David Warbeck as Captain Kirk

Janet Ågren as Jane Blake

Roberto Ricci as Professor Adams

José Lifante as Sergeant O'Brien

Miguel Herrera as Doctor Vince

Eugenio Benito as Father Braun

Ovidio Taito as

José María Labernié as Colonel Rutledge

Ilaria Maria Bianchi as

Fabián Conde as Drunk

Vittorio Calò as Pilot

Franco Ressel as Mr. Milton

Goffredo Unger as Distraught Man Outside Cinema