In 2001, Rosenbaum received a Saturn Award for his portrayal of Lex Luthor on Smallville. Continuing in the superhero genre, he played Wally West (a.k.a. The Flash) in the DC Comics animated series Justice League, Static Shock, and Justice League Unlimited as well as portraying a younger version of Wally West as Kid Flash in Teen Titans. In the third season Justice League Unlimited episode "Great Brain Robbery", Rosenbaum reprised his role as Lex Luthor when his character was trapped in Clancy Brown's Lex Luthor's body. In February 2008, Rosenbaum confirmed that he would be leaving Smallville after the seventh season of the show. After many months of speculation and him first turning down the contract to return, it was announced on February 11, 2011 that Rosenbaum would return to Smallville for the two-hour series finale, which aired on May 13, 2011, with Rosenbaum reprising his role as Lex Luthor.

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