When a well-loved headmaster decides to retire, his scheming pupils have other ideas. The cunning boys unleash a campaign of practical jokes, armed with gin, itching power, and bombs!

Kenneth Connor
as Mr. Gregory Adams

Charles Hawtrey
as Mr. Michael Bean

Leslie Phillips
as Mr. Alistair Grigg

Joan Sims
as Miss Sarah Allcock

Kenneth Williams
as Mr. Edwin Milton

Hattie Jacques
as Miss Grace Short

Rosalind Knight
as Miss Felicity Wheeler

Cyril Chamberlain
as Alf Hodgson

Ted Ray
as Mr. William "Wakie" Wakefield

George Howell
as Billy Haig
John Chard
Ding Dong and Allcock. The third of the Carry On series finds the gang up to their necks in strife at Maudlin Street Secondary Modern School. Headmaster William Wakefield (Ted Ray) is a fine and good man who doesn't believe in corporal punishment, this has endeared him to the children of the scho...