Clark is exposed to silver kryptonite, causing him to have paranoid delusions. The element makes him believe that Chloe is going to reveal his secret; Jonathan is scheming against him with Lionel; and Lex and Lana are having a secret relationship. Chloe and the Kents frantically search for a cure; however, it is Professor Fine (James Marsters) who comes to Clark's rescue -- but not without his own agenda.

Season 5 | Episode 7

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