Episode 50 of "Smallville"
s03e06 Relic
Title: Relic
Original Air Date: 11/05/2003 on WB
Director: Marita Grabiak
Writer: Brian Peterson, Kelly Souders
Guest Stars: William B. Davis (Mayor William Tate), Tom Heaton (Dex McCallum), Kendall Cross (Clark's Grandmother), Tim Henry (Private Investigator (Mason)), John Mann (Young Dexter McCallum), Peter Benson (III) (Lachlan Luthor)
Plot Outline:
Clark discovers that Jor-El was on Earth forty years ago. 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.