Fletcher discovers that his fellow inmates are planning to escape.
Ronnie Barker
Fletcher
Brian Wilde
Mr. Barrowclough
Fulton Mackay
Mr. Mackay
Richard Beckinsale
Godber
Peter Vaughan
Harry Grout
Graham Crowden
Prison Doctor
Sam Kelly
Warren
Christopher Biggins
Lukewarm
Carol Hawkins
Sandra
Elisabeth Day
Nurse
John Cannon
Prisoner (uncredited)
Eden Fox
