Clark's entire memory ends up getting erased when he confronts a thief who has a kryptonite-based ability to wipe out people's short-term memories. As Clark learns about his life, he's shocked to discover that he has superpowers.

A teen who has the power to turn people into stone wants to stay in high school forever, so he keeps students captive in a fake school that's built to look like Smallville High. Elsewhere, Genevieve and Jason threaten to kill Lex if Lionel doesn't give up the sacred stone.