At the Toronto FanExpo this past weekend, Laura Vandervoort confirmed she would appear in a single episode of the eighth and final season of the CW’s Smallville. Television’s Supergirl also made mention that there had been talk of her character once being considered for a spinoff series. She merely said it didn’t pan out without providing any details.

She did admit to being a huge Buffy the Vampire Slayer fan so working alongside Spike, James Marsters, was a thrill. When she was just beginning her career, she wrote series creator Joss Whedon about wanting to audition for the show, something he remembered when they finally met.

Smallville, with new villains and the same old romantic triangles will return September 18.

http://www.comicmix.com/news/2008/08/29/i-smallville-i-almost-begat-i-supergirl-i/

its too bad she won't be back for more episodes; after last season's Smallville was over, she returned to finish the season of Instant Star but they ended it so now she's out of work I guess...

So, this will be the "final season" of Smallville. I was wondering how
much longer they could delay the inevitable (Clark Kent becoming Superman),
since Tom Welling (who is 31) is already five years older than Christopher
Reeve was when he first played Superman, in 1978.