Michael Ausiello is reporting that Ken Leung – whose memorable turn as Uncle Junior’s mentally unstable protégé on The Sopranos last season turned many a head in Hollywood – is joining the cast of Lost next season. It’s believed Leung will be playing the recurring role of Russell, a brilliant mathematician who is capable of great insights and has a tremendous knowledge across various scientific fields. He’s expected to first turn up in February’s season premiere.

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