Smallville Onyx (Season 4, Episode 17)
TV-PG
TV Episode | 43 min | Action, Adventure, Drama

Smallville

Onyx (Season 4, Episode 17)

TV-PG

TV Episode | 43 min | Action, Adventure, Drama

A LuthorCorp experiment involving black kryptonite ends in failure, causing Lex to be split into two, his good half and his evil half. Clark must find a way to reverse the process before the evil Lex achieves world domination.

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Cast	+ Add Cast
13 cast members

Name	Known for
Tom Welling Clark Kent Clark Kent See fewer	Smallville (2001)
Kristin Kreuk Lana Lang Lana Lang See fewer	EuroTrip (2004)
Michael Rosenbaum Lex Luthor / Alexander Luthor Lex Luthor / Alexander Luthor See fewer	Guardians of the Galaxy Vol. 3 (2023)
Jensen Ackles Jason Teague (credit only) Jason Teague (credit only) See fewer	Supernatural (2005)
Allison Mack Chloe Sullivan Chloe Sullivan See fewer	Smallville (2001)
John Glover Lionel Luthor Lionel Luthor See fewer	Scrooged (1988)
Annette O'Toole Martha Kent Martha Kent See fewer	Superman III (1983)
John Schneider Jonathan Kent Jonathan Kent See fewer	The Dukes of Hazzard (1979)
Malcolm Stewart Dr. Sinclair Dr. Sinclair See fewer	Jumanji (1995)
Rekha Sharma Dr. Harden Dr. Harden See fewer	The Core (2003)
Craig Lapthorne Security Guard Security Guard See fewer	Dark Angel (2000)
Carra Maureen Fencing Instructor Fencing Instructor See fewer	Smallville (2001)
Morris Chapdelaine Alexander Luthor (uncredited) Alexander Luthor (uncredited) See fewer	Day of the Fight (2023)