Ep 11. The Clean Room Infiltration

It's Christmas time and the guys are working on a project at the university. As they try to finish up before the holiday break, they realize that they need to get into the clean room to complete their work. However, the room is off-limits for the holidays and the only way to gain access is by being invited to a special party that only a select few people are invited to.

The guys decide to do whatever it takes to get into the party, including pretending to be janitors and cleaning up after the event. Meanwhile, Penny, Bernadette and Amy decide to have their own holiday party and end up inviting Raj, who is feeling lonely after spending the season without his parents.

As the guys try to navigate the strict security measures in place at the clean room party, they encounter several obstacles along the way. Sheldon, in particular, struggles to fit in with the other partygoers and ends up causing an embarrassing scene.

Back at the apartment, the girls are having a great time until their gathering is interrupted by Sheldon's panicked phone call. They rush over to the clean room party to save the day, but not before Raj has a chance encounter with an unexpected guest.

Overall, The Clean Room Infiltration is a fun and festive episode of The Big Bang Theory that showcases the characters' determination to achieve their goals, even if it means going to extreme lengths. It also highlights the importance of friendship and spending time with loved ones during the holiday season.