Barbara Bach
Amanda Marvin
Acting
Claudio Cassinelli
Lt. Claude de Ross
Acting
Richard Johnson
Edmond Rackham
Acting
Beryl Cunningham
Shakira
Acting
Joseph Cotten
Prof. Ernest Marvin
Acting
Franco Javarone
Jose
Acting
Roberto Posse
Peter
Acting
Giuseppe Castellano
Skip
Acting
Franco Mazzieri
Francois
Acting
Cameron Mitchell
Decker (US version)
Acting
Mel Ferrer
Radcliffe (US version)
Acting
Eunice Bolt
Samantha (US Version)
Acting
Jim Alquist
James (US version)
Acting
Tom J. Delaney
Patterson (US version)
Acting
Bobby Rhodes
Rackham's Servant (uncredited)
Acting
Riccardo Petrazzi
Prisoner on Lifeboat(uncredited)
Acting