Watch Smallville Season 10 Episode 4 online via TV Fanatic with over 5 options to watch the Smallville S10E4 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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It's the 200th episode of Smallville! On this monumental installment, James Marsters returns as the character of Brainiac,as Clark attends his high school reunion.