After extricating herself from the Slitheen trap, Sarah rescues the children – and is appalled to find that Clyde has learned of the Slitheen’s presence and her own brand of special investigations. With the help of her computer, Mr. Smith, Sarah finds out more about the Slitheen and their plan to bring Earth to its knees. But when Luke sees the blueprint for a worldwide Slitheen power network, he realizes that his exceptional work on a science assignment has put the human race in jeopardy. The Slitheen put their plan into motion, plunging much of the world into darkness, and even independently-powered devices like cars and Sarah’s sonic lipstick won’t work. Armed with determination and no small amount of vinegar, Sarah and her friends take off at a run to save the world.
written by Gareth Roberts
directed by Alice Troughton
music by Sam Watts / title music by Murray Gold
Guest Cast: Joseph Millson (Alan Jackson), Juliet Cowan (Chrissie Jackson), Alexander Armstrong (Mr. Smith), Martyn Ellis (Blakeman), Ian Midlane (Jeffrey), Pamela Merrick (Wendy), Imogen Bain (Janine), Anton Thompson McCormick (Carl), Lachelle Carl (American Newsreader), Jimmy Vee (Carl Slitheen), Paul Kasey (Jeffrey / Blakeman / Janine Slitheen)
Notes: The Judoon (Doctor Who: Smith And Jones) are mentioned as pursuing the remaining members of the family Slitheen. Sarah apparently tips off UNIT to the need for a cleanup operation at the school.
LogBook entry by Earl Green