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?

Androvax the Veil returns to Earth and asks for the gangs help, but how can they trust him? Or is the threat posed by the Vault of Secrets great enough to overcome old enmities. And when the android guardians threaten destruction, is there really any other choice?

When an old enemy, Androvax the Veil, returns to Earth asking for help, the gang face a dilemma – should they trust him? Or does the legendary Vault hold an even greater terror? But a second threat arises, when android guardians threaten to destroy anyone who uncovers their secrets. As the battle between Sarah Jane, Androvax and the androids reaches its climax, Rani has to save her own mother from being caught in the crossfire. But as the Vault opens the destiny of the entire Veil species is at stake. Is it too late to save them?

Old Companions Sarah Jane Smith and Jo Grant meet for the first time to discover the truth when the Doctor is declared dead. An interstellar conspiracy gathers around UNIT Head Quarters as Clyde finds that he holds the fate of the Time Lord in his hand.

Old friends fight together - but is it too late to stop the sinister Shansheeth?

Clyde and Rani awake to find they are the only humans on Earth, even Sarah Jane Smith has vanished. But the Earth is not deserted, stalking the streets of London, strange forces gather.

Clyde and Rani only just manage to escape from the robots.

Regrouping with Gavin in a cafe, Clyde deduces that he and Rani were left behind after the robots abducted everyone else because of the two of them having been 'grounded' by the Judoon, although this fails to explain Gavin's continued presence. When Gavin runs off again, Rani and Clyde are confronted by the robots, who explain that they want the 'son and heir' (Although Clyde initially assumes that they want Earth's sun and air); Gavin's father - who he mentioned left his mother when he was young - was an alien prince, and with his father's recent death Gavin is the only viable heir to the throne.

Tracking Gavin down, Clyde and Rani explain the situation to him, convincing him to remove a ring that his father gave his mother to give to him; the ring acted as a bio-damper that prevented anyone from detecting his alien heritage. With the ring removed, the robots can sense him, and he agrees to accompany them back to his father's world, his last actions on Earth being to name Clyde and Rani a Lord and Lady of his people.

With Earth's population returned - having been sent to a 'warp shunt' while the robots searched - Sarah and Mr Smith create the necessary records to state that Gavin has moved to Australia, Sarah praising Clyde and Rani's accomplishments even when they were alone.

A harmless investigation turns into an epic quest across time and space.

Sarah Jane, Clyde and Rani fight across the centuries to be reunited.

No one can defend the earth forever, but who could ever replace Sarah Jane?

Sarah Jane has gone for good, and a new regime begins at Bannerman Road!