Warship - Season 3 (1976)

With the Hero in dock, about to take part in an important naval exercise, Commander Glenn is persuaded to spend the weekend with an old flame, and her husband. In his absence, Lieutenant Peek gets on the wrong side of the dockyard workers, and soon has the crew embroiled in a Union dispute.

Hero's continued lack of success in anti-submarine warfare exercises against HM Submarine Ovid rattle Captain Glenn's self-confidence and cause increasing tension between him and his officers. Ovid's captain and Glenn's old friend, Commander Tremayne, offers to set up a new exercise and make it into more of a learning experience for Glenn, but the constant changes in the training program and Glenn's apparent lack of concern for his crew lead to a showdown between him and his first lieutenant, Lt. Commander Beaumont.

A young nautical engineer has developed a new system of rudder stabilisation, and the Hero is chosen to test it. Unfortunately this brings the engineer face to face with a helicopter pilot recently involved in his brother-in-law's death.

Regulator Fuller is put in charge of 3D mess in a bid to curb the unruly behavior of AB Grogan and Smith who are picking on Seaman Dorrity. When deck games are instituted, Dorrity becomes the butt of the joke until he vanishes.

An officer on board a neighbouring vessel dies in strange but unsuspicious circumstances. Unsuspicious, that is, until the body of an old girfriend of his, is washed up ashore on the same day.

With Commander Glenn now in charge of HMS Hero the ship prepares for a naval inspection. Assisting Rear Admiral Staunton in this task is Mark Nialls, formally much respected captain of HMS Hero. Nialls and Glenn have a slight rivalry between them so Nialls is looking forward to winding Glenn up with the Naval tasks associated with the inspection. He wanders over to the ship to sow a few rumours as to what they could be. The tasks, called 'evolutions' help to demonstrate teamwork and initiative as well as being very humorous.

Commander Glen's brother, Eddie, faces dismissal from the RAF after an unauthorised low flying stunt above a moving vehicle. Eddie asks the Commander to defend him in the ensuing court martial, but Alan has reservations, not least because Eddie refuses to explain his actions.

A Panamanian luxury yacht has gone missing, along with its millionaire owner and his family. After an RAF Nimrod on reconnaissance spots a similar yacht, several hundred miles from the missing yacht's last known position, the nearby HMS Hero is ordered to investigate.

When his wife arrives in port from Glasgow, Fuller doesn't get the nice surprise that the crew suppose. Meanwhile, the Chief Petty Officer, who has recent marital troubles of his own, faces possible disciplinary action for allowing his problems to affect his work.

Following a fire at a MoD scientific station, on an island called North Krona HMS Hero is ordered there. They are to deliver bulk feed items and offer any assistance with any rebuilding they may require. When they land there they find the atmosphere rather frosty as one of the five people there is missing. Commander Glenn's investigations into what is going on is helped by the fact that one of the team there is a woman from his past.