The "Big Bang Theory" season 9 episode 23 is the second to last episode of the season, and things have been getting progressively more uncomfortable for two of the show's main couples, as Sheldon and Amy (Jim Parsons and Mayim Bialik) and Penny and Leonard (Kaley Cuoco and Johnny Galecki) face new challenges in their relationships.

A few weeks back, Food World News reported that as the season reached its finale, the "Big Bang Theory" season 9 episode 23 would feature the return of two beloved characters, which have never actually been in the same room together: Leonard's mother (Christine Baranski) and Sheldon's (Laurie Metcalf).

Now, The Inquisitr reports that the "Big Bang Theory" season 9 episode 23 is set to affect the relationships inside the show, particularly that of "Shamy" - and the show's producer, Steven Molaro, has spoken about what's going to happen in the next two weeks.

"He wants to know why he's getting grief about moving slowly, where if Leonard and Penny are an example of a couple moving forward, they've been engaged for over a year and can't even pick a date," said Molaro to The Hollywood Reporter when asked about "Big Bang Theory" season 9 episode 23. "Sheldon would tell you that he's already so far out of his comfort zone and that he should be getting awards for this, instead of getting grief for it. You're not in his brain, so, from the outside, it does look glacial. But if you're the tortoise and moving as fast as you think you can, in your head, you're running."

It looks like the "Big Bang Theory" season 9 episode 23 is presenting some SERIOUS issues for one of the show's most beloved couples!

Realty Today reports that, meanwhile, Raj (Kunal Nayyar) will have to make a major decision in his love life as his relationship with Emily (Laura Spencer) moves forward, while Howard and Bernadette (Simon Helberg and Melissa Rauch) keep on trying to make a home out of Mrs. Wolowitz's home - even though Stuart (Kevin Sussman) refuses to move out.

The "Big Bang Theory" season 9 episode 23 airs tonight on CBS - watch the promo photos and clips below!