Dr. David Whittaker (6 episodes, 1959-1960)
Marion Whittaker (6 episodes, 1959-1960)
Dr. Tony Wilson (3 episodes, 1960)
Captain Ross (3 episodes, 1960)
Malayan Girl (3 episodes, 1960)
Alice Simms (3 episodes, 1960)
Jim Herring (2 episodes, 1960)
Albert Williams (2 episodes, 1960)
Professor Axhem (2 episodes, 1960)
The Malayan (1 episode, 1959)
Robin Horsman (1 episode, 1960)
Inspector Wilkins (1 episode, 1959)
Bob Busby (1 episode, 1960)
Dr. Sam Newman (1 episode, 1959)
Dr. Phil Evans (1 episode, 1959)
Jim, the Policeman (1 episode, 1959)
Tom, laboratory assistant (1 episode, 1959)
Joe, laboratory assistant (1 episode, 1959)
Smith (1 episode, 1960)
Riordan (1 episode, 1960)
Renee (unknown episodes)