Newly released photos from this week’s episode of The Big Bang Theory feature the gang getting into party mode, girls on the hunt, and a very primped-up Penny.

Several new stills have hit the web from “The Santa Simulation,” which airs this week on CBS. The photos show the boys ready to ring in the holiday spirit (perhaps somewhat listlessly, in Leonard’s case) and preview a plotline starring Raj and the girls in what looks like a nightclub. Check out the photos right here!

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It’s also great to see that Stuart (Kevin Sussman) will finally be back on The Big Bang Theory. Sussman was promoted to a regular cast member for season 6, but has not appeared since “The Holographic Excitation.” Interestingly, though earlier in the season it was primarily Raj who bonded with Stuart in Howard’s extra-terrestrial absence, it looks like “The Santa Simulation” will see Sheldon and Wolowitz bringing the comic book store owner back into the fold of their semi-functional friendship.

And it looks like Raj is crashing a girl’s night out; aside from the assumed hilarity, we can’t help but wonder what kind of revelations this development might bring.

CBS’ official summary for the episode has this to say:

Sheldon revisits some Christmas memories during a game of Dungeons and Dragons, while Penny, Bernadette and Amy try to find a girl for Koothrappali when he joins the girls for ladies’ night.

Well, really – who doesn’t get nostalgic for holidays past over a few friendly rounds of D&D?

The Big Bang Theory airs at 8 p.m. on CBS.