X: The Unknown

Dean Jagger

Dr. Adam Royston

Leo McKern

Inspector McGill

William Lucas

Peter Elliott

Edward Chapman

John Elliott

John Harvey

Maj. Cartwright

Michael Ripper

Sgt. Harry Grimsdyke

Anthony Newley

LCpl. 'Spider' Webb

Ian MacNaughton

Pvt. Haggis

Peter Hammond

Lt. Bannerman

Kenneth Cope

Pvt. Lansing

Michael Brooke

Willie Harding

Frazer Hines

Ian Osborn

Neil Wilson

Russell

Stella Kimball

Willie's Nurse

Jameson Clark

Jack Harding

Jane Aird

Vi Harding

Neil Hallett

Harry, the amorous intern

Marianne Brauns

Zena, the amorous nurse

Max Brimmell

Hospital Superintendant

Brown Derby

The Vicar