Synopsis by Hal Erickson
In the concluding episode of Smallville's two-part season-three finale, a girl known as "Lindsey Harrison" (Adrianne Palicki) reveals herself to be Kara, a refugee from the planet Krypton. Making contact with fellow Kryptonian Clark Kent (Tom Welling), Kara demands that he come with her to fulfill his destiny -- and warns him that none of his earthly acquaintances can be trusted. Meanwhile, Clark's individual relationships with Lana (Kristin Kreuk) and Lex (Michael Rosenbaum) both take a surprising turn; Jonathan (John Schneider) comes clean about his "arrangement" with Clark's birth father, Jor-El; and Chloe (Allison Mack) discovers the hard way that curiosity can be fatal. As the episode (and the season) races to a conclusion, Clark is sucked into a strange new dimension, Jonathan has apparently met his destiny and fiery flames envelop the screen.