Writer
Hazel Adair
WRITER
Ronald Marriott
Stars (in credits order)
John Gabriel
John Armitage (1951-1953)
Richard Pearson
Professor Watkins (First series only)
Valentine Dyall
Gorgol (2nd series only)
Peter Hawkins
Petrio (Second series only)
Brian Smith
Ian Spencer
Bruce Beeby
Delpho (First series only)
Humphrey Lestocq
Self (Introduced each episode)
Betty Woolfe
Mrs. Spencer (First series only)
Michael Newell
Bilaphodorous
Isabel George
Pamela Vernon (First series only)
