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Checkmate is the seventeenth episode of the ninth season of Smallville, and the one hundred and ninety-first episode overall.
Tom Welling (Clark Kent / Kal-El),
Allison Mack (Chloe Sullivan),
Erica Durance (Lois Lane),
Cassidy Freeman (Tess Mercer),
Callum Blue (Zod),
Justin Hartley (Oliver Queen / Green Arrow)
Behind the Scenes
Allusions and References