David Broadnax as Geoffrey Graves

Stella Stevens as Liz

Arthur Brauss as Vincent Napier

Lena Farugia as Pamela (as Lena Nicols)

Brian O'Shaughnessy as Colonel Duncan

Len Sparrowhawk as Customs Officer

Larry Taylor as Vlees / Vlees' Twin

Ian Yule as Bill

Ronald France as Stanwell

Ken Gampu as Sue

Gordon Mulholland as Dr. Halstead

Marius Weyers as Agent Donelly

Norman Coombes as William Joyce

Victor Melleney as Major Travis