The internet recently went wild with the news that Michael Rosenbaum (a.k.a. Lex Luthor) would be returning to Smallville for the season finale. Now, for the first time in years, we're genuinely excited about an episode of that show. So with that in mind, we got to thinking about some other actors and actresses who we wish would find their way back to their former series for at least a guest appearance, even if they've already moved on to new roles.
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