Detective Ritchie

Derrick O'Connor

Ken

Gary Holton

Leo

Richard Thomas

Peter Clark

Jan, Ken's Girlfriend

Gwyneth Strong

Susan, Leo's Sister

Caroline Embling

Senior Police Officer

Jack Douglas

Billy Colvill

Police 1

P.H. Moriarty

Disco Doorman

Mel Smith

Police 2

Richard Hope

Police 3

Niall Padden

John Mulcahy

Terry Paris

School Masters 1

Neil Cunningham

School Masters 2

George Costigan

School's Security Guard

Stewart Harwood

Tammy Jacobs

School 2

Daniel Peacock

School 3

Paul Mari

Jimmy Hibbert

Club Manager

C.P. Lee

Disco 4

Kim Taylforth

Ken's Gang 1

Nula Conwell

Madeline Church

Ken's Gang 4

Gary Olsen

Ken's Gang 2

Madeleine Church

Ken's Gang 3 (as Peter Wilson)

Pete Lee-Wilson

Ken's Gang 5

Jesse Birdsall

Hospital Doctor

Roger Lloyd Pack

Nurse

Brenda Fricker

Nurse

June Watson

Reporter

Julian Hough

Ritchie's Wife

Geraldine James

Detective Ritchie (uncredited; Died before filming completed)

Richard Beckinsale

Girl at Police Station (uncredited)

Jane Gurnett