The Sarah Jane Adventures/Recap/S2/E09 E10 The Temptation of Sarah Jane Smith

Sarah Jane and the gang discover a fissure in time, leading to the day of August 18, 1951, the day that Eddie and Barbara, Sarah Jane's parents died in a car accident, while Sarah Jane herself as a baby was left in her pram on the side of the road. Luke thinks that it is a trap, but ends up following Sarah Jane through it anyway. She uses her Sonic lipstick to deactivate their car, and suddenly a storm begans to brew.

It turns out that it is a trap, set by none other than the Trickster, because the death of her parents was a fixed point in time, and the altering of it smashed open the Web of Time, allowing the Trickster to manifest himself on Earth.

Tropes

 * Changed My Jumper: Averted by Sarah Jane, who dresses in period clothing. Played straight by Rani.
 * Crapsack World: The alternate future created by the Trickster
 * Daddy Had a Good Reason For Abandoning You: Saving the future from the Trickster seems like a pretty good reason.
 * Heroic Sacrifice
 * I'm Mr. Future Pop Culture Reference: Victoria and David Beckham
 * Kid From the Future
 * Newspaper Dating
 * No Equal-Opportunity Time Travel: Briefly touched upon by Rani. Basically says "Yes, racism in the 50's. Now back to the plot!"
 * Recycled Script: Basically the same plot as the Doctor Who episode "Father's Day."
 * Schmuck Bait: The Trickster's trap
 * Stable Time Loop