THE 90-MINUTE SEASON FINALE IS PACKED WITH MURDER, BETRAYAL AND AN UNFORGETTABLE GRADUATION DAY FOR ALL – Clark (Tom Welling) begins to piece together the reason he was sent to Earth after he has a nightmare that something horrible is going to happen to Smallville and heads to the cave to seek answers from Jor-El. His biological father tells him he must reunite the three crystals immediately or a disaster of epic proportions will befall the planet and even Clark won't be able to stop it. Meanwhile, Lex (Michael Rosenbaum) first helps Lana (Kristin Kreuk) escape Smallville after the death of Genevieve Teague then takes shocking action to get one of the chrystals away from Lionel (John Glover). Realizing the crystals are connected to Clark, Chloe (Allison Mack) tries to stop Lex from discovering the truth.