Derrick O'Connor as Detective Ritchie

Gary Holton as Ken

Richard Thomas as Leo Turner

Peter Clark as Mike Simmonds

Gwyneth Strong as Jan, Ken's Girlfriend

Caroline Embling as Susan, Leo's Sister

Jack Douglas as Senior Police Officer

Billy Colvill as Williams

P.H. Moriarty as Police 1

Richard Hope as Police 2

Niall Padden as Police 3

John Mulcahy as Police 4

Terry Paris as Police 5

Neil Cunningham as School Masters 1

George Costigan as School Masters 2

Stewart Harwood as School's Security Guard

Tammi Jacobs as School 1

Daniel Peacock as School 2

Paul Mari as School 3

Mel Smith as Disco Doorman

C.P. Lee as Club Manager

Jimmy Hibbert as Disco 3

Kim Taylforth as Disco 4

Nula Conwell as Ken's Gang 1

Madeleine Church as Ken's Gang 2

Pete Lee-Wilson as Ken's Gang 3 (as Peter Wilson)

Gary Olsen as Ken's Gang 4

Jesse Birdsall as Ken's Gang 5

Roger Lloyd Pack as Hospital Doctor

Brenda Fricker as Nurse

June Watson as Nurse

Colin Campbell as Conductor

Julian Hough as Reporter

Geraldine James as Ritchie's Wife

Richard Beckinsale as Detective Ritchie (uncredited; Died before filming completed)

Jane Gurnett as Girl at Police Station (uncredited)