Recap / The Sarah Jane Adventures S1 E9-10 "The Lost Boy"

A news report on a family searching for their son, Ashley, who has been missing for five months, brings shock to Sarah Jane, for the missing boy Ashley looks exactly like Luke. Mr Smith compares their DNA, and confirms that Luke and Ashley are genetic matches, claiming Luke was not 'grown' by the Bane, but was kidnapped and experimented on.

Chrissie Jackson calls the police and reports Sarah Jane as a child abductor. Luke is released into the custody of his 'real' parents, Jay and Heidi Stafford, and Sarah Jane is arrested, only to be released by intervention of UNIT. Mr. Smith informs Sarah Jane that a research facility, called the Pharos Institute has been experimenting with psychic energy, engineered from alien tech. At the institute, she encounters a boy genius, named Nathan Goss, for whom she feels strangely uncaring.

Back at the Stafford's house, Luke is introduced to his room, and is suddenly locked inside by his 'parents'. Mr. and Mrs. Safford turn on their television and report to a being they call "the Xylok", saying that they have captured Luke.

The Slitheen are back for revenge, having used advanced compression tech to hide inside the skins of the very skinny Stafford couple and Nathan Goss.

The Xylok, mastermind of the scheme, turns out to be the alien computer Sarah Jane knows as Mr. Smith, carrying out the master directive given him by his original creators.


  • Adult Fear: The set up is discovering Sarah Jane accidentally kidnapped her adopted son and having her child taken away, only for him to be mistreated. It's honestly kind of terrifying.
  • A.I. Is a Crapshoot: Mr. Smith is the Xylok, and he's evil. Although strictly speaking he's working exactly as his original designers intended him to.
  • Batman Gambit: The Xylok's plan. He didn't expect the two parties being manipulated to join forces against him.
  • The Chessmaster: The Xylok.
  • Death of a Child: Implied but not shown; Korst, the young Slitheen, is wearing a twelve-year-old boy disguise that (given what is revealed about Slitheen disguises in their first Doctor Who appearance) must have been made by killing and skinning a real twelve-year-old boy.
  • Dramatic Drop: Maria drops the plate she's holding when she sees a news report about a missing boy who looks exactly like Luke.
  • Exposed Extraterrestrials: Slitheen, when not in human suits.
  • Fun with Acronyms: MITRE
  • Insufferable Genius: Nathan Goss.
  • Laser-Guided Amnesia: What Alan does to Mr. Smith, making him into a good guy.
  • Laser Hallway: The Pharos Institute has a dramatic but impractical outdoor laser grid. Which, even apart from the fact that Sarah Jane just zaps it with her sonic lipstick, completely fails to make up for the fact that there's apparently no security systems installed inside.
  • Readings Are Off the Scale: Luke's psychic energy.
  • Sealed Evil in a Can: The race of supercomputers that Mr. Smith belongs to.
  • Season Finale: A larger-than-normal set of stakes, returning villains, and a few revelations with the potential to seriously upset the status quo.
  • The Trap Parents: Luke is reclaimed by his real parents, and forced to say goodbye to his friends in Bannerman Road. It turns out that they're not his real parents, but part of a hostile alien scheme.
  • Wham Episode
  • Wham Line:
    Clyde: I've got this. It's a picture of Luke with that pair that reckon he's their kid. Only I think it's a fake, see? I thought you could do your analysing thing and-
    Mr. Smith: You're right, Clyde. It is fake. I faked it.
  • You Killed My Father: Korst, the young Slitheen boy from Revenge of the Slitheen disguised himself as Nathan Goss, and wanted to drain Luke of all his psychic energy, as revenge for his father, Kist being killed by his own machinery, although he didn't realise that Sarah Jane actually tried to save them both.