Maria and Clyde have recently moved to Ealing, and Luke, having been artificially created the previous day, has never attended school before.

At lunchtime, Luke unknowingly helps members of the Slitheen family, disguised as teachers and a student, solve a problem in an unstable capacitor system that can switch off the sun by converting its heat and light into energy.

Luke overloads the system with Sarah Jane's sonic lipstick, electrocuting Janine and Jeffery to death, while some of the other Slitheen teleport away.

Upon realising who she's dealing with, Sarah Jane quotes Rose Tyler's remarks on "Slitheen in Downing Street" from the episode "School Reunion".

The American Newsreader played by Lachele Carl previously appeared in the Doctor Who episodes "Aliens of London", "World War Three", "The Christmas Invasion" and "The Sound of Drums".