Walden and Alan will face a big hurdle before they are united in holy matrimony in the next all-new episode of "Two and a Half Men."

In the season 12 premiere of the long running comedy series, Walden suffered from a health scare that caused him to re-evaluate his life and want to adopt a child. He also realized that raising a child may help him get over the rut in his romantic life, notes Carter Matt. However, because it's easier for married couples to adopt rather than single males, he decided to propose to Alan and get legally hitched.

In the upcoming episode, which is titled "A Chic Bar in Ibiza," Alan will have doubts about getting married after he gets offended that Walden wants for him to sign a prenuptial agreement.

"When Walden asks Alan to sign a pre-nup, Alan gets offended and has second thoughts about getting married," states the official synopsis, according to AceShowBiz.

In addition, legendary singer Michael Bolton will make a guest appearance on the show and perform a tweaked version of the classic love song "When a Man Loves a Woman" at their wedding, reports Entertainment Tonight.

Jon Cryer also dropped spoilers about the highly anticipated same-sex wedding during a recent interview with Larry King, revealing that the two will share a kiss.

"He's a good kisser," said Cryer in a video clip.  "We both were very careful about breath mints."

Cryer also explained that it was Alan's idea to include Michael Bolton in the wedding since he's "never had the wedding he's always dreamed of. Now he's about to marry a billionaire, so you're got to figure that you're going to get a really awesome wedding. But of course Walden just wants to go down to the courthouse," said Cryer.

It also looks like Charlie Sheen still has hope in making an appearance on the popular TV sitcom before the series finale next year.

"I would definitely do it, yeah, yeah. If they'll still have me, I will be there," he recently Extra when asked if he may return for the series finale. "Yeah, I owe it some measure of closure. I owe it to the fans... I just think it makes sense."

He added that he has a vision for the series finale. "I have a brilliant idea, but don't want to give it away. It's the type of moment I think people would talk about for a long time and it wouldn't get in anybody's way. Think it would be a nice tip of the hat... they know I want to do it and I know they're open to it, so, guess we're just a meeting away from making it happen."

However, Cryer didn't seem optimistic that the former "Two and a Half Men" star will make a comeback.

"I don't know. The amount of bridges that would have to be repaired to do that? I don't know if they're reparable," he told King, according to the Detriot Free Press.

Cryer compared Sheen to "having an addict in your family. You keep hoping. I know the depth of him is a really good guy. The guy who was sober for six years."

Season 12 Episode 2 of "Two and a Half Men" airs on Thursday, Nov. 6 on CBS