The Fifth Doctor, Tegan and Turlough arrive on Sea Base 4, a nuclear warhead station under the sea that has some very nasty neighbours.
The Queen's youngest son is off to university, mainly because "I'm hopeless at anything else". Barry, his new bodyguard, has no time for the royal family and left school at fifteen. He certainly didn't volunteer for this job, and is damned if he's going to enjoy it. Yet he can't help liking the hopelessly unworldly young prince, at least, until they both set their eyes on the new American student!
Hester Collyer is rescued by a neighbor after attempting suicide in the flat she shares with her young lover, ex-RAF pilot Freddie Page. The neighbors alert her husband, who arrives at the flat only to find her fully recovered...
