Smallville: Season 3, Episode 6

3 - 6: Relic

Lana's great uncle, who was convicted of murdering his wife forty years ago, shows her a picture of the man he believes really killed her aunt, and she is shocked to discover the drifter looks just like Clark. Sure that the man is Jor-El, Clark's investigation leads him to a kryptonian medallion that allows him to see bits of the past and the life that Jor-El started for him long before he arrived on Earth...