Koothrappali sells out Leonard and Wolowitz after they lie to their wives. "The Solder Excursion Diversion" is the 19th episode of the show's ninth season.
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The boys run into problems when they file for a patent on The Big Bang Theory. "The Application Deterioration" is the 18th episode of the show's ninth season.
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Sheldon and Leonard hit the black market looking for helium on The Big Bang Theory. "The Helium Insufficiency" is the sixth episode of the show's ninth season.
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The boys take fencing lessons and Sheldon ends up in an awkward position with the instructor on The Big Bang Theory. "The Perspiration Implementation" is the fifth episode of the show's ninth season.
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The boys are must figure out what to do when they get a flat tire on The Big Bang Theory. "The Bachelor Party Corrosion" is the third episode of the show's ninth season.
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They made it to Vegas, and apparently did tie the knot, but will we actually get to see Penny and Leonard's wedding? It seems like with the build up, we'd get a little more. Remember the perfect rooftop wedding that Howard and Bernadette had?
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It looks like Leonard is a married man just as Sheldon finds himself newly single. The most important relationship on The Big Bang Theory is the friendship between Leonard and Sheldon, so seeing how they support each other (in their own unique ways) is bound to be one of the best parts of the premiere. I wonder what additions will be added to the roommate agreement?!
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Well, it seems as though they tied the knot! We really weren't sure if it would happen, but apparently Leonard and Penny do get married in Vegas. Still, they have a lot to discuss, and it isn't going to end here. How will Leonard's confession affect their relationship?
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Sheldon pushes Penny and Leonard to set a date for their wedding.
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The guys battle over how to construct a message for NASA on The Big Bang Theory. "The Communication Deterioration" is the 21st episode of the show's eighth season.
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Look who's back on The Big Bang Theory! Yup, Wil Wheaton makes another appearance in this scene.
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Sheldon faces a relationship crossroad with Amy when they build a blanket fort on The Big Bang Theory. "The Fortification Implementation" is the 20th episode of the show's eighth season.
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TBBT Quotes

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.