Down Among the Z Men

Down Among the Z Men is a Blackandwhite 1952 British comedy film starring The Goons Spike Milligan, Peter Sellers, Michael Bentine and Harry Secombe.

In an attempt to return the formula to the professor, Harry goes to an Army post, Camp Warwell, where he is mistakenly enlisted in the Z Men, ostensibly an elite unit guarding atomic secrets but in reality a ragtag group of reservists, retreads, and others of marginal at best competence. A pair of enemy spies kidnap an adjutant newly assigned to the camp. One of the spies then impersonates him at Camp Warwell.The posts commander, Colonel Bloodnok Sellers, has been assigned for security purposes a supposed daughter Carole Carr who is actually a female MI5 operative. Harry soon becomes smitten with the daughter, and they work together to foil an attempt by the secret agents to purloin Prof. Purehearts formula. ........

Source: Wikipedia