• 
  John Barrett

   Parsons (2 episodes, 1962)
• 
  Clifford Cox

   Howard Milroy (4 episodes, 1962)
• 
  John DeVaut

  Adamson
• 
  Mark Dignam

   Hopkins (4 episodes, 1962)
• 
  Howard Douglas

   Wilf Marner (3 episodes, 1962)
• 
  Alan Gifford

   Van Halloren (4 episodes, 1962)
• 
  Edward Harvey

   Harris (2 episodes, 1962)
• 
  Robert Harris

   Professor Cato (4 episodes, 1962)

• 
  Stuart Hoyle

   PC Mills (3 episodes, 1962)
• 
  Helen Lindsay

   Esmee Pulford (4 episodes, 1962)
• 
  Kenneth MacKintosh

   Edward (3 episodes, 1962)
• 
  Philip Madoc

  Richard
• 
  Norman Mitchell

  Sergeant Oakroyd
• 
  Clive Morton

  Colonel Swinton
• 
  George Pravda

  Smetanov

• 
  Arthur Skinner

   Holt (3 episodes, 1962)
• 
  Elizabeth Weaver

   Felicity Brent (4 episodes, 1962)
• 
  Gordon Whiting

   Meissonier (4 episodes, 1962)
• 
  Joyce Wright

   Jess Milroy (2 episodes, 1962)
• 
  William Greene

   John Brent (4 episodes, 1962)