Dennis Price as Martin Radley

Renée Asherson as Barbara Everton

Patrick Barr as John Everton

Duncan Lamont as Charles Wayne

Susan Shaw as Evelyn Gower

Bonar Colleano as Roommate

Alfie Bass as Ernie Gordon

Agnes Lauchlan as Laura Westcott

Brenda Hogan as Diana

Barbara Graley as Betty

Mavis Villiers as Gladys

William Franklyn as Sgt. Peter Thompson

Dandy Nichols as Charwoman

Erik Chitty as Ballistics Expert

Howard Layton as Surgeon

Nigel Neilson as Hubert

Alastair Hunter as Bookmaker