Mchale decides for Christmas he and the crew of PT-73 will pay a visit to the Sister Monique and the children dressed up in a Santa Claus outfit and elf outfits. Mchale would parachute from a plane first and meet the kids and PT-73 would follow a little while after. Mchale jumps in his Santa outfit but when he lands he finds the island was overtaken by Japanese and was captured. Mchale as usual cons he's why through the itterogation and he claims that a new secret weapon is on it's way, just then PT-73 arrives singing Christmas carrols and dressed in elf outfits. The Japanese commander becomes scared fearing that this was some kind new of physcological warfare and he surrenders.

A Naval Personnel Officer is coming to check out McHale for a stateside training position. Binghamton leads McHale and his crew to believe that the Officer is coming to check out Binghamton for a promotion, and transfer, so they shape up, so that Leadbottom will ship out. But, when McHale finds out the real reason for the Officer's visit, he and his crew cook up a plan, to get him off the hook.

The 73 gets a new crew member, who turns out to be a trouble-maker. McHale and the 73 crew cook up a wild plan to get rid of him, but, when their plan backfires, they find themselves in hot water again. So, they turn to their new Crewman, and use his special physical qualities to their advantage.

After laying some unusually harsh punishments on McHale and the 73 Crew, Binghamton mistakenly gets the impression that McHale and his men are out to kill him.

Christy finds out he's about to become a Father, so, while McHale is away in New Caledonia, Parker and the boys come up with a plan to raise money for expenses.

Lovely Yvette Gerard has invited Parker to join her for a weekend at her island home. When Binghamton denies him leave, McHale works up a plan for Parker to have a ‘working vacation' on the island, which winds up with an unexpected bonus.

Trouble ensues, when Parker inadvertently invites three of the 73 Crew's Mothers – Including his own – To visit Taratupa for Mother's Day.

Parker is feeling somewhat depressed, after getting scared during a chase after a Japanese patrol boat, especially after Binghamton accuses him of cowardice. But Binghamton changes his mind, when Parker – During a test run, on the 73 – Spots a German U-Boat, and goes after it.

A regulation-quoting lady Ensign tries to help McHale and the Crew make some much-needed money, by providing the participants for a beauty contest, and winds up helping them bag a German submarine, in the bargain.

Binghamton grants McHale and the 73 Crew a week's liberty in New Caledonia, but they must postpone their trip, when the 73 turns up missing, and they have to scheme to get a replacement.

Chief Urulu demands monetary compensation from the Navy, for destroying the coconut trees on his island, and puts a curse on Binghamton, when he refuses to pay.

McHale and the boys cook up a scheme to keep Binghamton from building a new Officer's Club on McHale's island.

The 73's engines are dying, and Binghamton uses the situation as an excuse to have McHale and his Crew reassigned. So McHale and the boys must scheme, to try to make the 73 healthy again.

The Navy has issued a directive stating that all overweight Combat Officers will be shipped out, and, when Binghamton goes all out to see that McHale goes over the weight limit, the boys cook up a plan to keep him with them.

McHale and the 73 Crew are missing, and presumed dead, and Binghamton uses the situation for attention from a visiting War Correspondent.

McHale and the 73 crew return from a mission, to find that a young Asian orphan girl has taken up residence on their island. They decide to keep her on the island, and go all out to make a happy home for her, and to keep her a secret from Binghamton. But Binghamton becomes suspicious, when he observes the crew's unusual behavior.

An Admiral from Naval Operations “ Who just happens to be a ranking member of the Promotions Board“ Is stopping in, briefly, at Taratupa, and Captain Binghamton dreams of Admiral's stars, especially when he learns that the Admiral has a very close relative stationed on Taratupa.

Parker requests a transfer, when a cute blonde Nurse he's involved with unintentionally demoralizes him. So, McHale, The Crew, and the Nurse work out a plan to make him feel better about himself.

Tinker is arrested for the theft of Binghamton's printing press, and The Captain taps Parker to be Tinker's Defense Counsel, in a trial which Binghamton, himself, will preside over. Parker and McHale must then stall the proceedings, while Gruber and The Crew execute a plan to get Tinker off the hook, with a bit of creative evidence-tampering.

Binghamton fakes an illness, and checks into the base hospital, appointing McHale as temporary Base Commander, to face an unscheduled inspection by a tough Admiral. But Binghamton's plan backfires, when McHale and The Crew manage to make it through the inspection, and turn the tables on The Captain.

McHale tries to figure out a way for Christy and his true love, Lt. Gloria Winters, to get married, even though it is against regulations for an officer to marry an enlisted man. But the lovebirds have even more problems: Binghamton schedules maneuvers on the evening of the wedding, and the Japanese schedule an all-out battle.

Binghamton sends McHale and The 73 Crew on a recon mission to a supposedly deserted island, where they make a ‘Home away from home' to enjoy themselves, away from the base. But, the U.S. Navy, as well as the Japanese, become suspicious, when they observe unusual activity on the island.

Binghamton's reputation as a ‘desk jockey' brings on a desire for some real combat experience, so, while McHale is away at New Caledonia, he assumes command of the 73, and goes out looking for action, with disappointing results.

A pesky Japanese Pilot – Whom the base personnel have dubbed ‘Washing Machine Charlie' – Is wreaking havoc, with his daily strafing runs on Taratupa, and McHale and the 73 Crew have an incentive to bring him down.

When a Japanese radio announcer broadcasts details about Captain Binghamton that only someone close to him would know, Binghamton immediately suspects McHale and The 73 Crew, and enlists Parker's aid in nailing the traitor.