Episode 402 is Smallville (2001)

"Pilot"

Baby Kal-El lands on earth and is found by the Kents. Kal-El is named Clark by Jonathan and Martha and tries to live a normal teenage life. This is somewhat of a challenge given his developing abilities. He becomes fast friends with Lex Luthor after saving Lex's life. Same plot used as the aired pilot except for some extension to certain scenes and Cynthia Ettinger portraying the role of Martha Kent before Annette O' Toole takes her place for the rest of the series.