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Eric Marsh (Zachery Bryan), Smallville High's star baseball player, is inhaling kryptonite to enhance his athletic prowess. Having become addicted to the substance, Eric ends up stealing some refined kryptonite from LutherCorp -- a theft witness by Clark Kent (Tom Welling). Keeping a low profile, Clark tries to have Eric arrested, only to be undercut by Lex Luthor (Michael Rosenbaum), who is more concerned with recovering the kryptonite than administering justice. The consequences are devastating when the now-unbalanced Eric goes on a destructive rampage.