Derrick O'Connor

Detective Ritchie

Gary Holton

Ken

Gwyneth Strong

Jan, Ken's Girlfriend

Jack Douglas

Senior Police Officer

P.H. Moriarty

Police 1

Richard Hope

Police 2

George Costigan

School Masters 2

Daniel Peacock

School 2

Mel Smith

Disco Doorman

Jimmy Hibbert

Disco 3

Kim Taylforth

Disco 4

Nula Conwell

Ken's Gang 1

Pete Lee-Wilson

Ken's Gang 3 (as Peter Wilson)

Gary Olsen

Ken's Gang 4

Jesse Birdsall

Ken's Gang 5

Roger Lloyd Pack

Hospital Doctor

Brenda Fricker

Nurse

June Watson

Nurse

Geraldine James

Ritchie's Wife

Richard Beckinsale

Detective Ritchie (uncredited; Died before filming completed)

Jane Gurnett

Girl at Police Station (uncredited)