It appears by a post from TV Guide and Kryptonsite , that the final episode will be a special 2 hour long one .
With one last appearance from Supergirl aka Kara El ( Laura Vandervoort ) !
That's good news , one last thing is needed thought to make it an epic episode , is the return of Michael Rosenbaum who's known to portray Lex Luthor ( producers are cautiously optimistic ) it would be nice to see Clark face off with him one last time as SUPERMAN !
Erica Durance who plays Lois Lane , also added that she would like to wear a classic dress in the finale and walk down the aisle with Clark in a wedding Dress .
SMALLVILLE season finale will be aired in May 2011