Mainwaring watches a film reel at the cinema which shows Winston Churchill inspecting Army troops and their mascot - a ram, of course where Mainwaring's concerned. If another platoon has a mascot, so must his. Sponge volunteers one from his farm but they have to catch it first; something that of course ends in complete disaster with Pike up to his neck in it - literally. Meanwhile the town parade is being organised and of course Mainwaring wants the platoon to lead, but Hodges has other ideas...

During home guard manoeuvres LCpl Jones, disguised as a log and helped by Frazer in a diving suit, floats down the river in order to attack the Eastgate platoon's headquarters.

Capt. Mainwaring decides to harden the platoon's feet by long route marches. When the platoon has had enough the men find a clever way of stopping him.

The platoon has moved to a new HQ's position on the beach. When Pike fails to turn up they find him caught up in the barbed wire at the waters edge. With the tide coming in, Mainwaring and Wilson mount a rescue mission, but someone else gets there first.

The platoon is manning the local lighthouse and accidentally switches on the light and can't find a way to switch it off. During an air raid they must find a way to cover up the glare.

LCpl. Jones goes to a reunion of his old regiment. While he is away an old comrade who fought in the same battle joins the platoon and accuses Jones of cowardice. Upon his return Jones has to tell the real story.

Capt. Mainwaring decides to enlist women to the platoon to assist with the war effort. After initial interviews go rather less than satisfactory, a Mrs. Fiona Grey walks into his office and into his life. Mainwaring is flattered that Fiona not only has similar views to him about the war, but also is complementary about his persona. He finds himself falling in love. Unfortunately the men very quickly realise and start to gossip behind his back and Fiona decides to leave, but can Mainwaring get to the station in time to stop her?

In a cricket match between the platoon and the ARP wardens, Chief Warden Hodges has a secret weapon up his sleeve: he plans to recruit Ernie Egan (played by England's fast bowler Fred Trueman), a professional cricketer. But all does not go as planned.

Sgt. Wilson becomes a manager of his own branch and gets a commission on the same day. But hours later his new branch is destroyed during an air raid. Mainwaring offers him his old job back and his former rank.

When the ARP Headquarters has been destroyed, Hodges and the wardens move into Mainwaring's office and the two of them start arguing over space. Later the chimney catches fire and they have to work together to put the fire out.

While the platoon is at a training camp, Mainwaring gets drunk with the other officers during the night and misses the live grenade training the following morning. Later during the training one of the grenades lands in Jones's van and Mainwaring rides to the rescue.

In Capt. Mainwaring's absence Wilson organises a darts match against the ARP in the local pub. When Mainwaring returns unexpectedly they have trouble getting the men back on parade.

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.

With the shortage of weapons, Capt. Mainwaring goes to the local museum to see if any of the guns on display can be used by the platoon.

Capt. Mainwaring, worried about the lack of weapons, gets a visit from Col. Square, an old soldier who offers to donate some guns from his collection, providing he can take command of the platoon. Mainwaring agrees until he sees the state of the guns.

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 is given a heavy naval artillery piece but the town's bandstand, a rare example of Victorian ironwork, stands in its field of fire. The town council insists it must be preserved but Mainwaring reasons that a demonstration of the gun's capabilities will quiet any protests.

The platoon is asked to provide guard duty at a testing ground for secret weapons, but when one of the devices gets out of control the platoon has to give chase.

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?

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?

After listening to a radio broadcast asking for men to form what was to become known as the Home Guard, George Mainwaring, a local bank manager, decides to act and form the platoon of his own accord. He appoints himself as Captain and recruits his chief bank clerk Arthur Wilson as the platoon sergeant as well as enlisting the bank's office boy Frank Pike. Several of the local tradesmen - including James Frazer, a philatelist shopkeeper; retired shop worker Charles Godfrey; Jack Jones the butcher and black market businessman Joe Walker - also volunteer their service for 'King and Country.' And so, The Walmington-on-Sea Home Guard was born.

When news that the Prime Minister is to pay a visit to the area a shooting contest is held to see which of the local platoons will form the honour guard. Walker gets a crack shot from the theatre touring show (Barbara Windsor) to take part as a member of the platoon but a surprise is in store for everybody.

The platoon holds a dance where Pike is going to announce his engagement to a local girl. Sgt. Wilson tries to get him to change his mind but Pike will not be put off.

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.