Characters played by Howard St. John
David Harding
Characters played by Amanda Blake
Karen Michelle
Characters played by Ron Randell
Simon Langton
Characters played by June Vincent
Barbara Taylor
Characters played by Fred F. Sears
Agent Peters
Characters played by John Dehner
Agent Bob Reynolds
Characters played by Lewis Martin
Dr. Victor Gilbert
Characters played by William Bailey
Assistant
Characters played by Robert Bice
Agent Fields
Characters played by Don Brodie
Jimmy
Characters played by Kernan Cripps
Bancroft
Characters played by Oliver Cross
Patient
Characters played by John Doucette
Larry -
Characters played by George Eldredge
Assistant
Characters played by Douglas Evans
Col. Kilgore
Characters played by Gregory Gaye
Prof. Schuman
Characters played by Everett Glass
Dr. Ritter
Characters played by Bill Hale
Agent
Characters played by Gloria Henry
Martha Holden
Characters played by Al Hill
Laundryman
Characters played by Ted Jordan
Brown
Characters played by Harry Lauter
Don Martin
Characters played by Jimmy Lloyd
Burton
Characters played by Paul Marion
Paul Heisl
Characters played by Charles Meredith
Miller
Characters played by Taylor Reid
Danning
Characters played by Jack Rice
Clerk
Characters played by Rick Vallin
McCullough
Characters played by Charles Williams
Taxi Driver