Smallville Season VII Episode XIV

Clark, preparing to set off for the Fortress, is attacked and kidnapped by a group of people using Kryptonite-imbued tasers. After finding out Lionel is responsible for the kidnapping, Lana and Chloe take Kara to the Fortress, where Jor-El restore her power and memories. Clark is imprisoned in a Kryptonite-laced cage, and before the guard is about to kill him, Kara tears down the door, saving his life. Dr. Swann's daughter, Patricia, comes to Metropolis, accusing Lionel of murdering her father, demanding to meet the "last son of Krypton". In the end, Lex has her killed.