The Big Bang Theory: Wedding Blues, Shamy's "Rough" Split and 6 More Things to Expect on Season 9

The Big Bang Theory is kicking off Season 9 with a wedding and a "divorce" of sorts.

While Penny (Kaley Cuoco-Sweeting) and Leonard (Johnny Galecki) are getting hitched in Las Vegas on Monday's premiere (8/7c, CBS), all is still not well between Sheldon (Jim Parsons) and Amy (Mayim Bialik), who wanted to take a break to reevaluate their relationship in the Season 8 finale.

Get the scoop on your favorite returning shows

Technology to the rescue Penny and Leonard's wedding is hardly a splashy affair, taking place in what Molaro describes as a "small and slightly depressing Vegas chapel."

[...] don't think the rest of the gang will miss their pals tying the knot.

"Like many Vegas chapels do these days, the weddings are available to be streamed online, so that's how they can watch," he says.

The other woman The honeymoon is over quickly for the pair when Penny brings up Mandy on their wedding night.

Leonard tries to diffuse the situation, but it's clearly not working.

Break to breakup After not getting the space she had requested from Sheldon, Amy will sadly pull the plug on their relationship, which only flummoxes Sheldon more.

Problems that are not easily solved by logic can be extremely frustrating for him.

There's a lot going on in his head and in any given scene, it can bounce back and forth.

Molaro, however, doesn't think either is at fault for the relationship's (temporary?) demise.

While painful and confusing for both of them, I think as far as people go, I think it's a great growth opportunity for both of them, which could ultimately be good for whatever their relationship ends up being, if they're back together or just friends.

Bad news for those of you hoping to learn Penny's last name during the wedding ceremony.

The Big Bang Theory returns Monday at 8/7c on CBS.