When Sarah Jane investigates the report of strange lights in the sky by the Tycho Project radio telescope, she discovers a lone surviving Sontaran from the failed conversion of Planet Earth who wants revenge for the passings of his comrades.



Meanwhile, Maria must make a decision when her father is offered a new job- in America.

Sontaran Commander Kaagh begins his plan for revenge against the planet- and Sarah Jane only has forty-five minutes to stop him.

Possessed by the Ancient Lights, Martin Trueman begins to take over the population via their star signs, one by one. Sarah Jane and the others must infiltrate Trueman's inner circle to stop him.

An alien pendant which gives the wearer the power to control others finds its way into the hands of one of Rani's schoolmates and then to Rani itself- but the use of the pendant causes a strange mark on the skin. Rani leaves it with Mr Smith for safekeeping. Meanwhile, Clyde has to face a family issue- after five years, his estranged father Paul comes to visit. But Clyde's decision to tell Paul about what he and the others do brings trouble when Paul takes the pendant...

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...

When Sarah Jane finds a time fissure, her curiosity leads her to go through it and she finds herself in 1951, in the village of Foxgrove, where she was born. Eager to see the parents she never knew, she makes a decision that will have catastrophic consequences...

With the Earth devastated under the control of the Trickster, Sarah Jane and Luke go back to 1951 and change things back to how they were- which means that Sarah Jane's parents must die. Will she make that sacrifice?

Mrs Wormwood returns to see Sarah Jane- but to ask help. The Bane have turned against Mrs Wormwood and are preparing to unleash a dark power against the universe. However, to thwart the Bane's plan, Sarah Jane must call upon an old friend.

Luke's dreams are being tormented by visions of Mrs. Wormwood. The Sontarans are back for revenge. Sarah Jane must once agian call on an old friend.