The people of Walmington-on-Sea are becoming apathetic about the war effort. When practicing on a firing range, Mainwaring is told to keep the noise down and Hodges is verbally assaulted for his efforts as chief warden. Mainwaring decides to scare his townfolk by getting the platoon to dress up as fifth columnists and marching through the countryside 'asking ze questions!' Will their plan work? Or will Mainwaring just end up looking rather silly in front of Capt. Square and the Eastgate platoon?

Capt. Mainwaring is to be an umpire in a war game exercise so he gets the use of a car. Pike meets a girl and uses the car to take her out, but they stay out all night and the whole town is shocked.

During a Wings For Victory fundraising event the platoon decides to stage a re-enactment of the battle between St. George and the Dragon, but friction starts when Hodges and the wardens plan the same thing.

Frazer is busy counting up his earnings when his doctor visits and accidentally knocks over a money box revealing that Frazer is far from poor. Concerned, the doctor alerts Mainwaring, who alerts Jones and very soon Frazer's fortune is the subject of town gossip. Eventually the platoon, Hodges, the vicar and the verger are spying on Frazer to see what he does with his money. Will they get their hands on it, or does Frazer have a sneaky trick up his sleeve?

The platoon takes over from the regular army in guarding some vital telephone wires. During an air raid a bomb lands in the wires and a way has to be found to get it down before it explodes.

LCpl. Jones wants to marry Mrs. Fox but has to get Capt. Mainwaring's permission. During the reception an invasion alert is called and Jones spends his wedding night on the beach doing guard duty. Note: as the end of the series, it aired on Remembrance Sunday and ended with a tribute from the platoon to the real Home Guard.