When Jonathan acts strangely, Clark believes that his Kryptonian father, Jor-El (voice of Terence Stamp), is sending Jonathan messages and is the cause for his father's withdrawal from the family. Clark goes down to the caves to confront his biological father, but Lionel finds Clark there and begins putting the pieces together -- leading him straight to reclusive scientist Dr. Virgil Swann (Christopher Reeve), who knows Clark's origins. As the two billionaires face off, a deal is struck, and Lionel's true motives are revealed.

Season 3 | Episode 17

Allison Mack

Chloe Sullivan

Annette O'Toole

Martha Kent

Erica Durance

Lois Lane

John Schneider

Jonathan Kent

Kristin Kreuk

Lana Lang

Michael Rosenbaum

Lex Luthor

Tom Welling

Clark Kent