Smallville: As Aventuras do Superboy Temporada 7 Episódio 6

Kara goes to Washington to look for her missing crystal, but is captured after she breaks into the lab. Shes sedated with a truth serum that has kryptonite in it, which makes her relive a trip to Earth from the past. In this past trip she followed Lara, Clarks biological mother, to the Kents farm. Clark saves Kara, but also ends up being affected by the serum when he burns it with his heat vision.