Smallville :

Clark reels from his first flashes of X-ray vision, one of the many superpowers that his developing body is adopting. His shock is compounded when he witnesses a bank robbery, apparently by his friend, Lex. But its turns out that an impostor, with amazing shape-shifting abilities, has been imitating Lex.

Unsure of how to control this new power, Clark nonetheless puts it to use when a Smallville teen who has developed shape-shifting abilities threatens Lana.