Smallville :

Clark decides to place the key into a slot in the cave wall. Upon inserting the key, the wall downloads him with the language of the cave. Dr. Walden discovers the key and uses it himself, but the information overload puts him in a coma. At home, Clark's heat vision forces him to etch a symbol onto the barn door. Determined to find out where he came from, Clark travels to New York to meet Dr. Virgil Swann (guest star Christophe Reeve, from the original Superman movies), a brilliant scientist who possesses a message for Clark from his home planet.

Meanwhile, Lana decides to move out of Chloe's house and into the Luthor Mansion, after the two girls get into another argument about Clark.