Maria moves into her new home and meets her neighbour Sarah Jane Smith. It isn't long until both of them find themselves at the local Bubble Shock factory and in terrible danger.

Maria and Luke start their new school where they pal up with another boy, Clyde. However, two of the teachers and the class genius turn out to be Slitheens in human form. They are shapeless smelly invaders from another planet whose aim is to destroy the Earth by turning off the Sun with the aid of a machine which Luke inadvertently helps them to start. The three teenagers are chased around the school by the Slitheen family.

The kids escape from the Slitheen and meet up with Sarah Jane at her house. They discover that vinegar will kill the Slitheen so, armed with vinegar bottles, they return to the school and destroy the three adult Slitheen and their machine. Carl, who took on the form of the class brain-box, escapes via a teleport but Sarah Jane assumes that he is dead. Back home she accepts Clyde into the group but asks for him not to tell others about their experiences.

Sarah Jane (Elisabeth Sladen) and her young friends investigate reports of a ghostly nun which is haunting the local old folks' residential home. And when one of the elderly residents entrusts Luke (Tommy Knight) with a mysterious alien talisman, it becomes clear there is even more to the story than meets the eye. The gang delves deeper, and discovers that the nun is part of a secret order sworn to protect a terrifying alien creature who can turn her victims to stone with a single look.

Maria's dad Alan (Joseph Millson) has been turned to stone. The alien talisman is now in the possession of the Gorgon and her evil nuns, and they are preparing to open the portal to their world. Can Sarah Jane (Elisabeth Sladen) and her young friends free Alan from his stony state, prevent the nuns from unleashing more deadly aliens on the Earth, and avoid the Gorgon's petrifying gaze?

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.

A haunted house, with mysterious whispers and secrets in the shadows - time for Sarah Jane Smith!

Sarah Jane and the gang discover the secret of Erasmus Darkening - but are they too late?

The Blathereen, arch-rivals of the family Slitheen arrive on Earth. In a move that surprises the gang they declare peace between Earth and Raxicoricofallapatorius and they offer Sarah Jane a gift, one that might change the future of the human race forever.

Sarah Jane faces the battle of her life to save her son from the effects of the gift of the Blathereen. Meanwhile trapped in the school, Rani, Clyde and K-9 fight to find a way to get to the attic, where the final showdown will take place.