This from
TV Line:
Current V alien Laura Vandervoort will reprise her role as Kara Zor-El (a.k.a. Supergirl) in one of Smallville‘s final five episodes, a show rep confirms to TVLine exclusively.
This marks Vandervoort’s second Smallville guest stint this season. (Both V and Smallville are produced by Warner Bros., which instantly eliminates a ton of red tape.)
Still no news as to whether Michael Rosenbaum will be back as Lex, but fingers crossed that he will!