CLARK AND LIONEL SWITCH BODIES - Clark (Tom Welling) hears a painful ringing sound in his ears and is drawn to the prison where Lionel (John Glover) is being held. When he sees Lionel attempt to stab Lex (Michael Rosenbaum) with a strange glowing stone, Clark grabs for the stone causing the two men to switch bodies. Learning his new body has super powers, Lionel immediately begins wreaking havoc on Smallville. Trapped behind bars without his powers, Clark must figure out a way to get his body and powers back in order to save his friends and family. Kristin Kreuk, Allison Mack, Jensen Ackles, Annette O’Toole and John Schneider also star. James Marshall directed the episode written by Todd Slavkin & Darren Swimmer (#406).