Maria and Luke start their new school, where along with their new friend Clyde, they discover a smelly alien race called the Slitheen have invaded their school. Can Sarah Jane foil the Slitheen's plans to destroy the planet?

The children race back to Sarah Jane's house to plan their attack against the Slitheen. Will they be able to destroy the Slitheen and their evil machine before it's too late?

Sarah Jane and the kids investigate after hearing that the mysterious ghost of a nun has been spotted at old folks' home, Lavender Lawns. Is there really something supernatural happening, or is it something else?

Things spiral out of control as Maria's dad comes face-to-face with the Gorgons, Luke and Clyde are in trouble, and the Earth is in imminent danger of a Gorgon invasion. Will it be too much for Sarah Jane?

Sarah Jane investigates when a teen mysteriously disappears. It turns out he was last seen at a video game centre, Combat 3000, and that more teens have gone missing after playing there. What is the centre's creepy manager, Mr Kudlak, hiding?

Sarah finally learns Kudlak's misguided motives for abducting the children, and she and Luke must pit their wits against the Mistress, a powerful computer, to win not only the freedom of the children but to end a cycle of useless war.