Patrick McGoohan as Johnny Cousin

Keith Michell as Cass Michaels

Betsy Blair as Emily

Paul Harris as Aurelius Rex

Marti Stevens as Delia Lane

Richard Attenborough as Rod Hamilton

Bernard Braden as Lou Berger

Harry Towb as Phales

María Velasco as Benny

Dave Brubeck as Himself - Piano

Charles Mingus as Himself - Bass

Bert Courtley as Himself - Trumpet

Keith Christie as Himself - Trombone

Ray Dempsey as Himself - Guitar

John Dankworth as Himself

Jennifer White as Girl (uncredited)

Carol White as Lucille (uncredited)