Dickie Dreadnought is the boxing-mad nephew of pious clergyman Reverend Sydney Mullet. To mollify his disapproving uncle, Dickie embarks on an elaborate plan to keep his budding boxing career a secret, with he and his tough-talking promoter Wally Burton both pretending to be devout 'men of the cloth'.

Brian Rix
as Dickie 'Dreadnought' Marchant

William Hartnell
as Walter 'Wally' Burton

Tommy Cooper
as Horace Hawkins

Vera Day
as Cynthia Tripp

Sidney James
as Sammy Gatt

Tony Wright
as Percy Gibbons

Leo Franklyn
as Rev. Sydney Mullet

John Robinson
as Archdeacon Pomphret

Renée Houston
as Mildred Pomphret

Arthur Mullard
as Tubby