The Sarah Jane Adventures

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.