Those are some serious daggers Sheldon is shooting special guest star Mayim Bialik in this exclusive image from The Big Bang Theoryâs May 24 season finale. But thereâs a thin line between loathing and lust - the only question is whether Jim Parsonsâ asexual physicist will cross it. A possible clue can be found in the fine print of the ex-Blossom starâs Big Bang contract. Sources confirm that the hitcomâs producers have an option to bring her brainiac character back next fall. Of course, a romance would seem to fly in the face of exec producer Chuck Lorreâs third-gender theory. Bottom line: I have no clue where this is leading.