Swinging playboy Grand Duke Nicholas Goduno, a direct descendent of the Romanov family who were overthrown in the Russian Revolution of 1917, learns that his family's crown jewels will be exhibited at a London museum and plots to steal them. To this end, he gathers a crew of beautiful but dangerous women, led by Bridget Rafferty, to assist in his plot against Popov, the Soviet functionary in charge of the exhibit.

In Frankie Howerd's third Up... film it's World War I and he plays Lurk, an absolute cowerd, er coward. He's evading the call-up for all he's worth. But one evening he's hypnotised by a drunken hypnotist (Stanley Holloway) into being brave, but he fails to be released from it. So with his yellow streak gone Lurk is down that army office before you can say "titter ye not." Off to war he goes, mingling with sexy spies like Zsa Zsa Gabor and before long, the spellbound recruit is heading hot-foot back to Blighty with the Germans' plan of attack tattooed on his bum, and the Germans are bringing up the rear...! Full of sauce, knowing real-life references and witty remarks to camera, this is a cheeky incorrigible final instalment.

A funny thing happened to Lurkalot, serf to Sir Coward de Custard, on the way to Custard Castle. Lurkalot sells lusty love potions and rusty chastity belts in the market place, but on this day Sir Graggart de Bombast arrives to sack the castle, and to get the lovely Lobelia Custard in the sack! Lurkalot must help Custard cream the knight in pining armour...