Michael Rosenbaum returns to Smallville for its finale. As seen here, he reprises the role of Lex Luthor.
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Lux Luthor will return for the final episode of Smallville. The character is played by Michael Rosenbaum.
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A picture of Michael Rosenbaum as Lex Luthor on Smallville. He was a major character until season seven.
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Smallville Quotes

I'm about as real as it gets.

Chloe

Oliver: You've done a hell of a job keeping the world safe on your own, Clark. I'm here to help you now.
Clark: Good. Something tells me...soon the world will need all the help we can get.