An American tourist, a youth gang leader, and his troubled sister find themselves trapped in a top secret government facility experimenting on children.
Macdonald Carey
as Simon Wells
Shirley Anne Field
as Joan
Viveca Lindfors
as Freya Neilson
Alexander Knox
as Bernard
Oliver Reed
as King
Walter Gotell
as Major Holland
James Villiers
as Captain Gregory
Tom Kempinski
as Ted
Kenneth Cope
as Sid
Brian Oulton
as Mr. Dingle
Barbara Everest
as Miss Lamont
Allan McClelland
as Mr. Stuart
