Chuck

The Gretas of Chuck are no more.

In Monday's episode, Sarah (Yvonne Strahovski) and Chuck (Zachary Levi) will find out that the side mission Casey (Adam Baldwin) has been working on involves him joining a new team. And his co-workers are not called Greta anymore.

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Former pro wrestling star Stacy Keibler and Old Spice guy Isaiah Mustafa return to the Chuck-verse as sleuths who have become Intersects like Chuck. If this promo isn't proof enough, someone else now knows kung fu!

"I'm doing a little bit of kung fu and I went through gun training, so I'm doing a lot more physical stuff," Keibler tells TVGuide.com. "In this episode, you're going to get a little bit of back story as to what we were actually doing as the Gretas and see who we really are."

Her character, now known as Capt. Victoria, is actually partners with fellow former Greta, Capt. Rick (Mustafa). As you might guess, Chuck will take a kick out of the "Rick and Vic" moniker. In the episode, "You see them earning their stripes," Mustafa says. "You see how they become the new duo."

So who are these agents? They belong to Bentley (Robin Givens), whom we briefly met a few episodes back when she approached Casey to quit being the backup man and finally step into the spotlight.

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Bentley happens to have a friendly rivalry with the Team Intersect boss, Gen. Beckman (Bonita Friedericy). "Bentley definitely respects that Beckman's good at what she does, but she also thinks that she's good at what she does, so she enjoys that sparring," Givens says. "She really has something in mind that she wants, so she's willing to go around Beckman to get it."

"She's a no-nonsense gal who really is coming in to shake things up a little bit," Givens continues. "I don't really think she has any mercy with [Casey, Chuck and Sarah] in terms of the relationships that have already been established."

As for Chuck, Givens says her character will "push him emotionally. She's going to challenge him. How good are you at what you do? She challenges both [Chuck and Sarah] and says, 'Look, my guys can be better than your guys.'"

"Sarah gets very offended and doesn't take it very well," Strahovski says of Casey's new team. "She's just so used to having Casey and Chuck at her side that for Casey to be doing anything that she has no idea about is a betrayal almost. They try and resolve things."

Chuck airs Mondays at 8/7c on NBC.