After a schoolmate (guest star Jeremy Lelliott) claims to be an alien and seemingly backs it up by using heat vision, Clark (Tom Welling) investigates and begins to believe that the guy is from his planet Krypton. Meanwhile, after Helen (guest star Emmanuel Vaugier) discovers a locked room in the mansion she demands to know what is behind it, forcing Lex (Michael Rosenbaum) to come clean about his investigation of Clark.