Mark Kingston (as Terence Longden)
Inspector Wills
Prof. Taylor
Ronald Fortescue
Mary Johnson
Jill - Waitress
Sir Lionel - College Dean
Detective Sergeant Willoughby
Joy Clark
Man Tailing Mark Kingston
College Tutor
Waitress in Cafe
(as Ann Sharp)
Jimmy - Newspaper Editor
Police Constable
Harry Gregg
Man at Reception Desk (uncredited)