Insp. Davis

Jim Medway

Captain Jumbo Hoyle

Jack Williams

Robert Graham

Peter Tanner

Mark Roper

Kenneth Palmer

Stephen, Author

Ivan Mason / Dr. James Paxton

Duke Popplewell

Maxwell Oliver

Dallas Chaytor

Joe Marsh

Denys Royd

Bruce Banning

Detective Grey

Group Captain J. N. H. Whitworth, D.S.O., D.F.C.

Sgt. Peter Burden

Hans Glaser

Detective Inspector Minter

TV Announcer

Tony Teale

Minor Role

Sergeant Wilson

Ranny

Dr. Erasmus Potter-Shine

Gerald Ryton

Anthony

Minor role

Laurie Baxter

Earl of Salisbury / Sir William Lucy

Lord Say

Duke of Exeter / Mayor of York

Sir Robert Brackenbury / Earl of Surrey

Sam

Count Brisini

The Major

Pemberton Grant

Michael Tone