A big change is coming to The Big Bang Theory.

On the sitcom's fourth season finale, Sheldon and Leonard will part ways. As teased to Entertainment Weekly by producer Bill Prady: “You have a situation where Priya is staying with her brother, and Leonard is spending time with Pryia. The current sleeping arrangement isn’t the best one. I think a little experimentation with people in different spots [is necessary].”

Who will take over as Sheldon's new roommate? Prady says it will be a human being with whom viewers are familiar:

"One of the things that Sheldon will [learn from] his new roommate - temporary or permanent, we don’t know - is just how long Leonard has been skating by. He’s going to have a terrific experience with this new roommate.”