Doctor: David Tennant (Tenth Doctor)
Companion: Billie Piper (Rose Tyler)
Nina Sosanya – Trish
Abisola Agbaje – Chloe Webber
Edna Doré – Maeve
Tim Faraday – Tom's Dad
Abdul Salis – Kel
Richard Nichols – Driver
Erica Eirian – Neighbour
Stephen Marzella – Police Officer
Huw Edwards – Commentator
Directed by Euros Lyn
Written by Matthew Graham
Script editor Simon Winstone
Produced by Phil Collinson
Executive producer(s) Russell T Davies
Incidental music composer Murray Gold
Production code 2.11
Series Series 2
Length 45 minutes
Originally broadcast 24 June 2006
The TARDIS materialises on the day of the opening ceremony of the 2012 Olympic Games. The neighbourhood is preparing for the passing of the Olympic torch bearer, but the mood has been dampened by the disappearances of several children in the prior week. A council worker named Kel also mentions that cars have been breaking down momentarily for the same period. The Doctor and Rose investigate and realise that the source of the problems is a solitary 12-year-old girl named Chloe Webber. She has the unique ability to cause people to disappear by drawing them. The Doctor hypnotises Chloe and finds out that she is possessed by an immature Isolus, an alien life-form that travels through space with a family of billions. This particular Isolus crashed its pod to Earth due to a solar flare. The Isolus relates to and befriends Chloe, who had a troubled childhood. The Isolus has also caused Chloe to draw a life-sized, exaggerated figure of her late father, who is strongly implied to have abused Chloe when he was alive.
The Doctor explains that if they can find the Isolus pod and provide it power, the alien will leave Chloe. A frantic Chloe draws the TARDIS and the Doctor, trapping them both in one of her sketches and forcing Rose to try to find the pod herself. She rationalises that the pod is located on the hottest spot on the street, a patch of freshly laid tar, and is able to dig it up. Meanwhile, Chloe has caused the entire crowd at the Olympic stadium to disappear and now is set on making everyone in the world disappear. Rose tries to find out how to power the pod, and uses visual indications from the Doctor's picture to understand that the pod needs heat mixed with emotion. Rose throws the pod towards the Olympic Torch - a symbol of hope, courage, and love - as it passes down the street. The missing children and the crowd at the Olympics reappear, and Rose realises that the drawing Chloe had made of her father will similarly come to life. Rose and Chloe's mother are able to calm Chloe by singing the Kookaburra song, causing the unseen monster - having fed off of Chloe's emotions and fears - to disappear.
As the torch bearer approaches the Olympic Stadium he collapses, and the Doctor promptly and suddenly appears, picks up the torch, and completes the run to light the Olympic Flame. The heat of the flame and the emotion of the crowd power the pod, allowing the Isolus to leave Chloe and return home. The Doctor and Rose walk off to watch the games, and Rose remarks that nothing will ever split the two of them up. The Doctor becomes uneasy and muses that a storm is approaching.