PLOT
A top-secret chemical formula has been stolen by STENCH (the Society for the Total Extinction of Non-Conforming Humans). Fearful of the formula falling into the wrong hands, the chief of the Secret Service reluctantly sends the only agent he has left, the bumbling and silly Agent Desmond Simpkins (Kenneth Williams), and his three trainees—Agent Harold Crump (Bernard Cribbins), Agent Daphne Honeybutt (Barbara Windsor), and Agent Charlie Bind (Charles Hawtrey)—to retrieve the formula.
The agents travel separately to Vienna, where each makes contact with Carstairs (Jim Dale), who assumes a different disguise each time. Next, they rendezvous at the Cafe Mozart and later travel on to Algiers. Upon the way, they encounter STENCH agents the Fat Man and Milchmann (who stole the formula whilst disguised—befitting the English translation of his German name—as a milkman). Unfortunately, the agents' ineptitude results in Carstairs being floored in an encounter with the Fat Man.
Daphne and Harold attempt to steal the formula back whilst disguised as dancing girls in Hakim's Fun House, where the Fat Man is relaxing. The agents also encounter the mysterious Lila (Dilys Laye), whom they are uncertain to trust. With the STENCH henchmen close on their heels, the agents have no other choice but to have Daphne memorise the formula with her photographic memory, before the four of them destroy the formula papers by eating them with soup and bread.
The four agents end up captives of STENCH. Daphne is interrogated by the evil Dr Crow (played by Judith Furse and voiced by John Bluthal), head of STENCH, but she fails to succumb until she accidentally bumps her head, causing her to reveal the formula. Simpkins, Crump, and Bind manage to escape their cell and to collect Daphne and Dr. Crow's tape recording of Daphne's recitation, but are caught up in an underground automated factory process, from which they escape only when Lila pulls a gun on Dr Crow, forcing her to reverse the process.
Simpkins sets the STENCH base to self-destruct before rushing into a lift with the other agents, as well as Lila and Dr Crow. As the lift ascends, Lila reveals to Simpkins that she is a double agent working for SNOG (the Society for the Neutralising of Germs) and that she has a crush on him. The lift reaches the surface, which is revealed to be the office of the chief of the Secret Service; the headquarters of STENCH is right below the streets of London. STENCH headquarters self-destructs, choking the chief's office in a thick cloud of smoke.
CAST
Kenneth Williams as Desmond Simkins (codename Red Admiral)
Barbara Windsor as Daphne Honeybutt (codename Brown Cow)
Charles Hawtrey as Charlie Bind (codename Yellow Peril)
Bernard Cribbins as Harold Crump (codename Bluebottle)
Jim Dale as Carstairs
Eric Barker as The Chief
Richard Wattis as Cobley
Dilys Laye as Lila
Eric Pohlmann as The Fat Man
Victor Maddern as Milchmann
Judith Furse as Dr. Crow
John Bluthal as The head waiter
Renée Houston as Madame
Tom Clegg as Doorman
Gertan Klauber as Code clerk
Norman Mitchell as Native policeman
Frank Forsyth as Professor Stark
Derek Sydney as Algerian gent
Jill Mai Meredith as Cigarette girl
Angela Ellison as Cloakroom girl
Hugh Futcher as Bed of nails native
Norah Gordon as Elderly woman
Jack Taylor as Thug
Bill Cummings as Thug
Anthony Baird as Guard
Patrick Durkin as Guard
Virginia Tyler as Funhouse girl (uncredited)
Judi Johnson as Funhouse girl (uncredited)
Gloria Best as Funhouse girl (uncredited)
Audrey Wilson as Amazon guard (uncredited)
Vicky Smith as Amazon guard (uncredited)
Jane Lumb as Amazon guard (uncredited)
Marian Collins as Amazon guard (uncredited)
Sally Douglas as Amazon guard (uncredited)
Christine Rodgers as Amazon guard (uncredited)
Maya Koumani as Amazon guard (uncredited)