Pictures from this week's new episode of CBS' Big Bang Theory have now hit the Internet, giving fans more details on what lies ahead in its upcoming episode titled Monster Isolation.

The newest set of stills reveal the peaks and valleys of Raj's heartbreak with his potential love interest and another installment of Fun With Flags, which includes a rare appearance of Penny donning her chops as an actress.

CBS released the following summary on Thursday's upcoming season 6 episode:

"After a terrible date, Koothrappali vows to never leave his apartment. Meanwhile, Penny actually impresses Sheldon with her acting skills."

It appears as though Kate Micucci, who showed up briefly as Lucy in last week's Valentine's Day episode, will add more heartache to Raj. Also, Penny's appearance in a real play could suggest that she may finally be set to hit it big in her endeavors.

Last week's half-hour lover's day extravaganza featured a slew of love in the air for the beauties and geeks of the sitcom, but complications arose when Kaley Cuoco's real-life sibling, Briana Cuoco, showed up on the show.

The romantic foursome - which consists of Leonard, Penny, Howard and Bernadette - went out together on a double date. While Leonard and Howard had plans of treating their significant others to a nice dinner, the situation didn't exactly go as planned.

While dining, Penny saw her ex-boyfriend Matt and the girl that he cheated on her with, Gretchen - Cuoco's sister.

As Penny and the group dealt with the encounter, Raj and Stuart planned a singles-only party at the comic book shop in order to meet some ladies of their own, as Sheldon and Amy searched for girls themselves.

A new episode of The Big Bang Theory is set to air on Thursday at 8 p.m. EST on CBS.

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