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

Smallville Quotes

I'm about as real as it gets.

Chloe

Pete: Clark, you've got the whole package: looks, brains, and that whole farm boy charm.