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Lex was once Clark's best-friend growing up, however Smallville sees the transition Lex undergoes to become his most hated nemesis.

Michael Rosenbaum

Michael Rosenbaum plays Lex Luthor, the longtime friend of Clark Kent (Tom Welling) who has now become his arch nemesis, on Smallville.

Born in Oceanside, New York, and raised in Newburgh, Indiana, Michael Rosenbaum excelled in high school drama classes. Once hooked, he took on lead roles in college stage productions such as The Heidi Chronicles while attending Western Kentucky University and performing in regional theatre during his summers.

Upon graduation with a degree in mass communications and theatre, Rosenbaum headed for New York to pursue acting. He quickly landed roles in off-Broadway productions and small independent films and soon segued into regular appearances on Late Night with Conan O'Brien in a sketch called The Amsterdam Kids.

His first real break came when he got a series regular role on The WB's comedy series The Tom Show, with Tom Arnold. The relationship with the network continued as he was cast as Jack in the New York comedy Zoe, Duncan, Jack & Jane.

Rosenbaum recently completed filming a comedy feature titled Kickin It Old Skool, starring alongside Jamie Kennedy. Rosenbaum can also be seen in Wes Craven's thriller Cursed, with Christina Ricci. Rosenbaum appeared in the feature film Bringing Down the House, opposite Steve Martin. He can be seen in the independent film Poolhall Junkies, with Chazz Palminteri and Christopher Walken. Other film credits include Sorority Boys, with Barry Watson, and Sweet November, with Keanu Reeves and Charlize Theron. Rosenbaum also starred in the hit thriller Urban Legend and appeared in Midnight in the Garden of Good and Evil, directed by Clint Eastwood and starring Kevin Spacey and John Cusack.

Rosenbaum resides in Los Angeles.  When not working, he belongs to an ice hockey league, having played the sport since childhood, and he is a dedicated New York Rangers fan.