Bonar Colleano as Dan MacDonald

Susan Shaw as Pat

Renée Asherson as Sally

Earl Cameron as Johnny Lambert

Moira Lister as Maisie

Max Adrian as Charlie Vernon - acrobat / George

Joan Dowling as Pamela, Maisie's sister

James Robertson Justice as Engine Room Officer Trotter

Leslie Phillips as Harry

Alfie Bass as Alf

John Longden as DI Williams

Michael Golden as Customs Officer Andrews

Christopher Hewett as Mike

John Adams as Plainclothes Policeman in Squad Car (uncredited)

John Arnatt as Squad Car Officer (uncredited)

Mae Bacon as Ethel the Barmaid (uncredited)

Ian Bannen as Garage attendant (uncredited)

George Benson as George (uncredited)

Arthur Bentley as Pamela's Boyfriend (uncredited)

Beckett Bould as The Murdered Watchman (uncredited)

John Boxer as Detective in Pub (uncredited)

Michael Corcoran as Sam (uncredited)

Arthur Cortez as Jock (uncredited)

Dan Cressey as Customs Officer (uncredited)

David Davies as Officer on the Dunbar (uncredited)

Frank Forsyth as Police Constable Witnessing Robbery (uncredited)

Rowena Gregory as Mary (uncredited)

Fred Griffiths as Sailor on Barge (uncredited)

Pat Hagan as Squad Car Officer (uncredited)

Ellis Irving as Superintendent (uncredited)

Sam Kydd as 2nd Engineer (uncredited)

Howard Lang as Detective Detaining Suspect (uncredited)

James Liggat as Bit Part (uncredited)

Victor Maddern as First Tram Conductor (uncredited)

Jack May as Sailor on the Dunbar (uncredited)

George Merritt as Captain of Dunbar (uncredited)

Arthur Mullard as Seaman on the Dunbar (uncredited)

Laurence Naismith as Commissionaire (uncredited)

Paul Rich as Singer in Pub (uncredited)

Jack Sharp as Dock Worker (uncredited)

Campbell Singer as Station Sgt. (uncredited)

George Spence as Pub Patron (uncredited)

Ivan Staff as Edward - Speaker at Hyde Park Corner (uncredited)

Eric Thompson as Garage Pump Attendant (uncredited)

Frederick Treves as Detective at Bank (uncredited)

Mavis Villiers as Drinking Club Blonde (uncredited)

Michael Ward as Pianist (uncredited)

John Warwick as Inspector Jim Moss (uncredited)

Russell Waters as Sgt. - River Police (uncredited)

Henry Webb as Speaking Extra (uncredited)

Meadows White as Alf - Theatre Performer (uncredited)