Laura Vandervoort is bringing Supergirl back to Smallville - and we know why.

On the May 6 episode of this CW smash, one week prior to its grand finale, Kara team up with Oliver, as the latter searches for a way to remove the Omega symbol from his skull. TV Guide has a photo of the pair in action.

"Oliver is faced with this cold reality that he's not going to be able to get rid of this infection just by willing it away," Justin Hartley says. "He goes on this journey to try to get rid of it."

What role does Clark's cousin plan in this mission? Teases the star:

Along the way, look for duo to "find out things about each other, that everything isn't what it seems, that you can't judge a book by its cover."