The following information is derived from material held in the Crawford Collection:
Alfred Sandor (Knight), Judy Lynne (Barbara), Brian Wenzel (Frank), Bryon Williams (Lewis), Geoffrey O'Bonnell (Murray), James Bowles (Harry), Kurt Beimel (Alex Hackman), David Mitchell (Starkey), Peter Felmingham (Max), John Clayton (Hunt), Les James (Barney), Denzil Howsen (Holland), Keith Lawrence (Ray), and Frank Spencer (Sam).
The casting call sheets held in the Crawford Collection also show the following information:
Other actors considered for the role of Lewis included Paul Karo and Tim Elliot.
Other actors considered for the role of Alex Hackman included Ken Wayne, Peter Gwynne, Simon Chilvers, and Peter Aanensen.
Other actors considered for the role of Starkey included Alan Bickford.
Other actors considered for the role of Max included Charles Gilroy, Max Murray, and Rod Birch.
John Clayton's stand-in was stuntman Tony Sprague.
Other actors considered for the role of Holland included Syd Conabere.
Other actors considered for the role of Ray included Harold Reid.
Other actors considered for the role of Sam included Louis Seater.
