When Chloe accidentally inhales a mysterious gas, she discovers that it gives her the ability to get the truth from anyone who comes in contact with her -- and she goes to the Kents to find out Clark's secret. However, her new power is not without its consequences, and Clark must find an antidote before she discovers too much about him or, worse, dies.

Season 3 | Episode 18

Allison Mack

as Chloe Sullivan

Annette O'Toole

as Martha Kent

Erica Durance

as Lois Lane

John Schneider

as Jonathan Kent

Kristin Kreuk

as Lana Lang

Michael Rosenbaum

as Lex Luthor

Tom Welling

as Clark Kent