CLARK VISITS THE FORTRESS OF SOLITUDE AND LANA FINDS A SPACESHIP - Having been transported to the Fortress of Solitude, Clark (Tom Welling) is confronted by Jor-El, who tells him he cannot return to Smallville, instead he must stay and prepare to save the planet. Also, transported to the Fortress, Chloe (Allison Mack) is unable to handle the sub-zero temperature and collapses, begging Clark to use his powers to save her. Jor-El forbids him to leave, but finally acquiesces, telling Clark he must return before sunset or there will be dire consequences. Meanwhile, Lana (Kristin Kreuk) is horrified when she sees two Kryptonian aliens emerge from a spaceship discovered in the remnants of the meteor shower. The two aliens destroy what's left of the town searching for Kal-El. Michael Rosenbaum, John Glover, Erica Durance, Annette O'Toole and John Schnieder also star. Todd Slavkin & Darren Swimmer wrote the episode directed by James Marshall (#2T6401).