THE 90-MINUTE SEASON FINALE IS PACKED WITH MURDER, BETRAYAL AND AN UNFORGETTABLE GRADUATION DAY FOR ALL – Clark’s (Tom Welling) high school graduation ceremony is interrupted by a second meteor shower that hits Smallville. Clark goes to the caves to confront his father Jor-El, who says that if Clark does not reunite the three Kryptonian crystals, Earth will be annihilated. Meanwhile, Lex (Michael Rosenbaum) helps Lana (Kristin Kreuk), out of a bloody situation she finds herself in. His motives, however, are not solely in her best interests. As disaster looms, Chloe (Allison Mack) and Lois (Erica Durance) try to find Lana while Clark attempts to reassemble the stones, and someone makes an unexpected return to make things unpleasant for the Kents.
MARTHA’S SECRET IS REVEALED – Clark rushes to find an antidote after Martha is infected with a toxic virus and falls into a coma, but when Clark also falls ill, it is up to Jonathan to find a cure in time. To further complicate things, Dr. Bryce demands an explanation from Jonathan when he refuses to let her treat Clark.