Characters played by John Agar
Capt. Don Graham
Characters played by Carl Ottosen
Commander Eric
Characters played by Ove Sprogøe
Barry O'Sullivan
Characters played by Louis Miehe-Renard
Svend
Characters played by Peter Mönch
Karl
Characters played by Greta Thyssen
Greta Thyssen
Characters played by Ann Smyrner
Ingrid
Characters played by Mimi Heinrich
Ursula
Characters played by Annie Birgit Garde
Ellen
Characters played by Ulla Moritz
Lise
Characters played by Bente Juul
Colleen
Characters played by Julian Burton
Alien Brain