The Sarah Jane Adventures: The Temptation of Sarah Jane Smith(2008)

A little boy from the early 1950s wanders through a time gap into the present and Sarah Jane returns him, finding herself and Luke in Foxgrove the village where she was born. It is the day that her parents, who left her by the roadside as a baby,will be killed in a car crash. She meets them at a village fair and, to prevent their deaths, tampers with the car. When she and Luke return to the present, a ruined London is in the grip of the Trickster, who appears to thank her. the little boy was the Graske, sent to force her to change time. The village was built on a time fault and her tampering with it enabled him to come through a time fissure and take over the capital.