The Sarah Jane Adventures

S01E01 Revenge of the Slitheen (1)

Maria and Luke begin their new school adventure and quickly befriend a boy named Clyde. However, they soon discover that two of their teachers and the top student are actually Slitheens disguised as humans. These grotesque aliens from another planet plan to annihilate Earth by extinguishing the Sun using a machine that Luke accidentally activates. The trio finds themselves on the run from the menacing Slitheen family as they try to thwart their dangerous scheme within the school.