Characters played by Guy Rolfe
Mark Fenton
Characters played by Lisa Daniely
Lisa Durand (nurse)
Characters played by Patricia Dainton
Sister Rogers
Characters played by Sydney Tafler
Wade
Characters played by Ballard Berkeley
Inspector Austin
Characters played by Anton Diffring
Schroder
Characters played by Michael Golden
Harrison
Characters played by James Raglan
Sir Oliver Peters
Characters played by Avice Landone
Mrs. Terry
Characters played by Brian Worth
Geoffrey Terry
Characters played by Eric Berry
Colonel Williams
Characters played by Edward Dentith
Sergeant Lewis
Characters played by Alexis Chesnakov
Ship's Captain
Characters played by Ann Bennett
[no data]
Characters played by Jean Hardwicke
[no data]
Characters played by Derek Aylward
(uncredited)
Characters played by William Franklyn
Dr. Gillespie
Characters played by Desmond Llewelyn
Police Constable at barrier