S1 Ep5 : The Lost Boy

THE LOST BOY

EPISODE: 5 - Part 1 and 2
AIR DATE: November 12, 2007 & November 19, 2007
VILLAINS: Slitheen. Mr. Smith
MONSTERS/ALIENS: Slitheen, Xylok
OTHER CHARACTERS: Alan Jackson, Chrissie Jackson, Jay, Heidi, Nathan, Prof. Rivers, K-9
PLOT:

Following on from Alan Jackson's discovery of what Sarah Jane and Maria Jackson do together in Whatever Happened to Sarah Jane?, he threatens to move house again, only to have a change of heart when he sees how upset Maria is. His condition for not moving away, however, is that he is kept up to date with their battles against aliens.

Luke is purported to be a missing child, Ashley Stafford

The Staffords are revealed to be new, "thinner" Slitheen
However, a news report on a family searching for their son, Ashley, who has been missing for five months, brings a shock; for Ashley looks exactly like Luke. Mr Smith compares their DNA, and confirms that Luke and Ashley are genetic matches; apparently Luke was not 'grown' by the Bane, but was a kidnapped boy. Chrissie Jackson calls the police and reports Sarah Jane as a child abductor; Sarah Jane is arrested and the police relieve Luke into the custody of Ashley's parents, Jay and Heidi, and Sarah Jane is detained by the police, only for UNIT to intervene and have her released. Depressed, Sarah Jane decides she was wrong to involve children and tells Maria to stay away from her. Mr. Smith suggests she take on a case in order to take her mind off things, and she visits the Pharos Institute a research centre where alien technology is being used to conduct experiments into telekinesis. Here she meets the annoying child prodigy Nathan Goss. That night, Luke's new parents watch television and switch over to a channel that glows green; they announce to the Xylok that they have the boy in their possession.

Clyde is trapped inside the evil Mr. Smith

The news is bad for the Earth — and the Moon
Luke's new parents are extremely abusive towards him, keeping him locked up in his room at all times. Clyde Langer cuts school to visit Luke, but Heidi does not allow him. Heidi claims that her son is a keen skateboarder, which worries Clyde as he knows Luke has a poor sense of balance and is a dreadful skateboarder; he decides to bring a photo of Jay and Heidi to Mr Smith. Luke becomes frantic upon seeing Clyde leave the house, and desperately begins making attempts to escape. Mr. Smith, meanwhile, sends Sarah Jane back to the lab to steal one of the headsets there, which he claims he needs to analyse to work out Nathan's plans. Clyde gets to the house only seconds after Sarah Jane has left, but takes the photo to Mr Smith anyway, only for Mr Smith to confess that he faked the photo. It turns out that Mr. Smith is the Xylok, and he fires a bolt of energy at Clyde, causing him to vanish.

Back at Luke's new home, his 'parents' are meeting with Nathan, just as he is breaking out of his room, with the result that he fails to escape, but succeeds in discovering that his parents are actually Slitheen using improved compression technology, and Nathan Goss is in fact Korst Gogg Thek Lutiven-Day Slitheen, a child Slitheen Luke encountered previously, now in a new disguise and looking for revenge.

Clyde awakes to find himself inside Mr. Smith as Sarah Jane Smith returns from the Pharos Insitute, having successfully stolen a telekinetic headset. Elsewhere, Maria and Mr Jackson go to Ashley's house, where they find a skinsuit and Maria realises the Slitheen have Luke. Mr. Jackson then receives a message on his computer from Clyde, who states Mr. Smith has turned evil. The Jacksons and Sarah Jane confront Mr. Smith and are nearly killed as it fires a bolt of energy from a built-in gun.

K-9 takes a break from black holes long enough to protect Sarah Jane from Mr. Smith
The Slitheen take Luke to the Pharos Institute where they test his abilities. Luke overcomes the Slitheen and escapes, as Maria, Mr. Jackson and Sarah Jane arrive. Working together, they discover Mr. Smith's intentions with Luke and Mr. Jackson adapts a computer virus that could destroy Mr. Smith. Using the Slitheen teleporter, Sarah Jane arrives in her attic, where Mr. Smith is using Luke to awaken other Xylok from the Earth's core. Clyde returns when Mr. Smith states he is merciful, but threatens the duo with its gun. Sarah Jane unlocks a safe and calls on K-9. The robots battle and Sarah Jane inserts the virus, which makes Mr. Smith forget its purpose. As the Moon grows closer to the Earth, Sarah Jane tells Mr. Smith it has a new purpose: to safeguard planet Earth.

The Moon returns to its original position, K-9 goes back to the safe to safeguard the black hole and the Slitheen return to Raxicoricofalipatorious. As Sarah Jane, Maria, Luke, Clyde, Alan and Chrissie watch the ship leave, Sarah Jane reflects how she never thought she could be part of a family...