Harry Palmer
Major Dalby
Colonel H.L. Ross
Jean Courtney
Jock Carswell
Dr. Radcliffe
Bluejay
Barney
Housemartin
Alice
Charlady
Edwards
Gray
Chilcott-Oakes
Inspector Pat Keightley
Sir Robert
Raid Inspector (as Michael Murray)
Raid Sergeant (as Antony Baird)
O.N.I. Man
Taylor
Records Officer
Murray
Operator
Police Station Sergeant
Prison Doctor
Prison Guard (as Joseph Behrmann)
Prison Guard
Rita (scenes deleted)
Security Clerk (uncredited)
Security Guard (uncredited)
R.S.M. (uncredited)
First Agent (uncredited)
Scientist (uncredited)
Audience Member at Symposium (uncredited)
Bluejay's Minder (uncredited)
Tea Girl (uncredited)
Technician (uncredited)
Dalby's Staff (uncredited)