Smallville S03E20 – Talisman

Jeremiah Holdsclaw, a young Kiwatche Indian, steals a mythic knife from the tribal caves and gets superpowers similar to Clark's. Jeremiah believes he is the fulfillment of the ancient prophecy of Naman, "the man who fell from the stars." He sets out to kill Lionel with the knife, and Clark must stop him without revealing his own secret.