Details the lives of John Lennon and Yoko Ono, from before their first meeting to their rise to stardom.

The Fifth Doctor, Tegan and Turlough arrive on Sea Base 4, a nuclear warhead station under the sea that has some very nasty neighbours.

Romana fancies a proper holiday and convinces the Doctor to visit the leisure planet Argolis, where a takeover by the Argolins' historic enemy is underway.

Henry Wilt is a more or less failed teacher who fantasizes about murdering his dominant, non-attentive wife Eva. At a party who gets stuck in an inflatable doll and makes a complete fool of himself. Eventually, he dumps the doll in a hole at a building site. However, he has been witnessed getting rid of the doll and when his wife disappears on the night after the party, the police and Inspector Flint have strong suspicions on Mr Wilt.

Knights from a parallel universe arrive on Earth to find the legendary sword Excalibur. Only the Doctor and Ace, with the assistance of Brigadier Lethbridge-Stewart, can save the Earth from total catastrophe.

The reputation of the Academy for the Daughters of Respectable Monarchs has, of course, always been of the highest order... then suddenly Signor Doloro de Lara— a Professor of Magic—puts in an unwelcome appearance, and the enchanting little world is turned upside down.