Big Brother's Dr. Will Kirby Makes Surprise Cameo on 'The Traitors'

Fans of Peacock's hit competition series The Traitors knew they'd see some former Big Brother players on season 2, but probably weren't expecting one familiar face in particular from the long-running CBS series to show up.

Big Brother season 2 winner and legend of the game, Dr. Will Kirby, makes an appearance during season 2 of the Peacock series, which is highlighted in a brand new promo.

In the newly released teaser, the celebrity dermatologist can be seen sitting in his Scottish garb with a smile on his face surrounded by wolves.

So far, there's been no mention of his appearance or explanation as to what role he may play in the game, but the network is calling him a "special guest."

"Is that Dr. Will?" a woman can be heard saying.

It also remains to be seen what fellow Big Brother players Dan Gheesling and Janelle Pierzina, the former of whom won season 10, and the latter of whom has played alongside Kirby before, think about his surprise cameo.

"No different than a slumbering creature at the bottom of a dark, Scottish Loch, my presence is, though rare, a sight to behold," Kirby, Chief Medical Officer of LaserAway, exclusively tells Parade. "All tongues must confess and all heads must bow when the monster awakens."

In addition, season 1 favorite Kate Chastain, alum of Bravo's Below Deck, is set to return to the game as a player in the January 25 episode. "There's a new guest in my castle," host Alan Cumming says.

Chastain sits at the roundtable. "Tell me everything," she asks her fellow competitors. "Who do we hate?"

Set in Scotland, the series features a cast of reality stars who work together to earn money in missions and build a prize pot of up to $250,000. Most of the players are deemed "Faithfuls," while a few are secretly name "Traitors." Their ultimate goal is to murder the Faithfuls and claim the prize for themselves.

The Traitors streams new episodes on Peacock every Thursday at 9 p.m. ET.