Luke is going for a sleepover at Clyde's house whilst Sarah Jane goes away for the weekend, during which Clyde's estranged father Paul turns up hoping to get to know his son. Meanwhile Rani discovers that one of her classmates is in possession of a strange locket, that can be used to control people.

With Clyde's father Paul possessed by the alien pendant, he takes Clyde off for some fun. With a little help from some old friends, Rani and Luke try and track them down, leading to a waterside confrontation with the Berserker

Far in the future, in the year 2059, Old Rani remembers the day when her whole life went wrong.

Eve's powers grow out of control, catching everyone in her endless sinister games.

When Luke has his first nightmare, he's haunted by a dark figure from his dreams. A strange entity is reaching out to our world, with terrible consequences for the whole human race. Luke faces life-changing events, and Bannerman Road will never be the same again.

With Luke, Clyde and Rani trapped in a bizarre dreamscape, Sarah Jane must fight alone. As the Nightmare Man grows stronger, only K-9 might hold the key. But can Luke summon the courage to face his adult life before the whole world is trapped in an endless nightmare?