Maria Jackson has just moved into a new house with her recently-divorced father when she becomes aware of strange goings-on involving her reclusive neighbour, journalist Sarah Jane Smith. But things get even weirder when Maria's new friend, Kelsey, invites her on a tour of a factory which produces the mysteriously addictive energy drink Bubbleshock. There, Maria rescues a strange boy, and has nowhere to turn but to Sarah Jane herself. Together, they must discover the connection between Bubbleshock and an alien plan to conquer the Earth.

Sarah Jane, Maria, Luke and Clyde must save the Earth before the Slitheen switch off the sun.