Paul Rogers
— Mr. Verloc
Frances White
— Winnie Verloc
Robert Hardy
— The Assistant Commissioner
Anton Rodgers
— Mr. Vladimir
Joyce Carey
— Lady Dorothy
Peter Sallis
— Chief Inspector Heat
Michael Gambon
— Tom Ossipon
John Cater
— The Professor
Vernon Dobtcheff
— Karl Yundt
Bruce Purchase
— Mr. Michaelis
Vivienne Burgess
— Winnie's Mother
Peter Clough
— Stevie
Ann Queensberry
— Guest
Andree Evans
— Guest
Sara Van Beers
— Guest