Poor Sheldon. Everything's going to change now that Leonard and Penny are moving in together. Who is going to be his new roommate? Find out more info with our latest "Big Bang Theory" season 9, episode 4 spoilers below!

According to TVGuide.com, the synopsis for next week's "Big Bang Theory" episode, titled "The 2003 Approximation" reads, "Sheldon reverts back to 2003 when he learns that Leonard and Penny are moving in together. Meanwhile, Howard and Raj form a band to play at the comic book store."

Futoncritic.com reports another synopsis for the "Big Bang Theory" season 9, episode 4, which reads, "Sheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny. Also, Howard and Raj form a band to play at the Comic Book Store."

Can we expect an episode full of flashbacks? Or are we just going to be in Sheldon's imagination? We can't wait to take a trip down memory lane in next week's episode!

Can Sheldon's new roommate live up to Penny and Leonard? We doubt it!

We do know who will be playing some of Sheldon's possible roommates. According to the listing, the guest cast will include: Craig Welzbacher (Candidate #1), Kurt Koehler (Candidate #2), and Arshad Aslam (Candidate #3). We'll have to tune in next week to see if any of these candidates get chosen as Sheldon's new roommie.

Watch the promo preview videos below for "Big Bang Theory" season 9, episode 4 below.

Episode 4 is scheduled to air on Monday night, October 12th at 7pm central time on CBS.