Fans of "The Big Bang Theory" cannot wait for the big reveal on what truly happened between Leonard (Johnny Galecki) and Sheldon's (Jim Parsons) parents. Fortunately, CBS has finally released its lineup for the fall. 

According to TV Line, the comedy series is set to premiere its tenth season Monday, Sept. 19. However, it will revert back to its regular air time on Thursdays starting Oct. 27. Viewers only have to wait for three months to know if Alfred (Judd Hirsch) and Mary (Laurie Metcalf) really ran away together during last season's finale. Leonard's parents were in town to attend their son's wedding to Penny (Kaley Cuoco). Sheldon's mother was also invited. No one could predict that Alfred would find Mary attractive and vice versa. When the others wake up in the morning, they could not find the pair anywhere.

Executive producer Steve Molaro told Entertainment Weekly that all the details on what truly happened would be revealed during the premiere. He said that Alfred and Mary originally wanted to go out for a nightcap and unwind. If they indeed eloped, it was difficult to say. When asked if Leonard and Sheldon would be brothers soon, the EP refused to comment, but said that it is going to be awkward for them.

"I don't know what happened. I know they were getting along quite well, and left to go to the same hotel for a nightcap, and turned off their phones. The details of exactly what happened, if we even ever find out all the details, will be left for the season premiere of season 10," Molaro teased.

Meanwhile, another storyline to watch out for is the arrival of Howard (Simon Helberg) and Bernadette's (Melissa Rauch) baby. It also remains to be seen if Sheldon will pop the question and propose to girlfriend Amy (Mayim Bialik).

"The Big Bang Theory" season 10 will premiere on Monday, Sept. 19, at 8 p.m. EST on CBS.