Quantico Sneak Peek: Marcia Cross Arrives in D.C. With Something to Hide

Now this is the Marcia Cross we remember.

The Desperate Housewives alumna guest stars in the fall finale of ABC’s Quantico (Sunday, 10/9c), and as you’ll see in the preview clip above, her deceptive smile game — perfected during her eight-year stint on Wisteria Lane — remains very strong.

But what exactly is Cross’ senator character — who also happens to be the mother of Graham Rogers’ Caleb — hiding behind those pearly whites?

Hit PLAY on the video above to pick up on a few clues, then drop a comment below: What do you think is up with Caleb’s mom?