The platoon finally gets to grips with the enemy when it has to guard some Nazi submariners. But the Germans turn the tables on Mainwaring and try to escape, resulting in Jones ending up with a grenade down his trousers.

The platoon decides to give a party to the visiting American troops. When the Yanks start to get fresh with the platoon's girlfriends, all hell lets loose.

When classified news is shared that the King is to travel through Warmington-on-Sea by train, Capt. Mainwaring and the platoon are detailed to form a guard of honour. Then, when another train breaks down on the main line, blocking the King's route, the platoon swings into action.

The platoon has gone to a camp to undergo an efficiency test. Meanwhile Walker has a van load of onions he's sold to Hodges, who isn't letting them out of his sight, thus he has pursued the platoon to the camp. Later, with no blank shells to use on the test, Mainwaring has a brainwave regarding what to use as ammunition!

When a relative of Sgt. Wilson dies, he inherits his title. Then, when a Russian factory worker visits the town to boost Anglo-Russian relations, Mainwaring is asked to present the key to the town - until the mayor hears about Wilson's title, and asks Mainwaring to step down.

The platoon gets lost on a wild and stormy night and has to take shelter in an old and deserted house that is used for training tracking dogs. When Pike gets his uniform wet he changes it for an old German uniform, but when the dogs get loose, they chase Pike and the platoon across the fields.

Note: Last regular appearance of James Beck as Pte. Joe Walker. Walker only appears in the external scenes as Beck was taken ill shortly before the studio scenes were recorded.

Capt. Mainwaring has gone into hospital for an operation on ingrowing toenails. Meanwhile Wilson as acting CO has asked the vicar and the verger to join the platoon to make up the numbers.

Note: This is the first episode not to feature James Beck as Pte. Joe Walker, although Beck is still included in the closing credits.

As all the road signs have been removed from the area, the platoon is ordered to put up temporary ones to help a large convoy on manoeuvres that is due to drive through the area, but due to the condition of the ground Jones's van gets stuck in the mud.

Pike gets his head caught in the park railings and the platoon is summoned to help. Meanwhile a large bomb has exploded near the town and has put out the gas and water supplies. When Mainwaring returns to hear what has happened he puts the town under martial law.

On a field exercise acting as commandos meeting a secret agent, represented by Mainwaring, the platoon must trust no-one for GHQ has sent out counter agents to catch them. The appearance of a gorilla compounds their problem.

The platoon dresses up as Morris Dancers as part of a carnival to raise money for the town's Spitfire fund, which is still £2,000 short. A Lady Godiva figure will lead the parade but there is confusion over who this will be.

Lady Maltby offers her Rolls Royce to Capt. Mainwaring for use as his staff car. After the car has been disguised with camouflage paint, it has to be repainted black, because the mayor's car has run out of petrol, and there's no official car to greet a visiting VIP.

After the platoon accidentally shoots a turkey, attempts are made to return it to the local farmer, but he will not accept it so the men come up with the idea of providing a dinner for the local OAPs.