The story begins with the death of a cat. For Mrs Everton, the owner, it climaxes four months of terror during which she has been paying two young brothers £1 a week to keep them from carrying out their threats against her two cats.Although Mrs Everton is aware that the two boys aren't responsible for the cat's death, she nevertheless sets out to wreak revenge.

When the TARDIS lands in the sea off the eastern coast of England, the Second Doctor, Jamie, and Victoria investigate a nearby beach, which seems to have an improbably large amount of sea foam as well as a major gas pipe marked “Euro Sea Gas” What is really happening at "Euro Sea Gas." Can the Second Doctor, Jamie and Victoria survive "The Fury from the Deep"!