Bill Williams
— Capt. Mead Ralston
Norma West
— Jan Ralston
John Cairney
— Dr. Steven Thomas
Jeremy Longhurst
— John Saunders
Kathleen Breck
— Kate Saunders
Donald Churchill
— Carl Walcott
Margo McLennan
— Joyce Wolcott
Linda Marlowe
— Dr. Helen Thomas
Tony Doonan
— Dr. Griffith
Mark Lester
— Don Wolcott
Stewart Middleton
— Michael Thomas
Anthony Honour
— Robert
Max Kirby
— Ho-Ho the Hologram
John Lee
— Dr. Garth