Watch Smallville Season 9 Episode 21 online via TV Fanatic with over 7 options to watch the Smallville S9E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Hulu Plus, and Verizon On Demand.
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Zod and his soldiers launch an attack on Earth on Smallville's season finale. This results in an epic battle between Clark and his nemesis. Elsewhere, Tess clings to life.