Leech

S1 E12: When Clark rescues his classmate, Eric Summers (Shawn Ashmore), from harm during an electrical storm, they are both struck by lightning -- resulting in all of Clark's superpowers being transferred to Eric. While Eric relishes his new life as "Superboy," he soon begins to abuse his new powers. Clark's happiness at finally being a "normal" teenager is tempered by his growing concern for the town's safety. Meanwhile, Lex confronts Clark, believing that he has undeniable proof of Clark's superpowers.