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It's been two years since the gang known as the Wolfpack narrowly escaped disaster in Bangkok. Now, Phil (Bradley Cooper), Stu (Ed Helms) and Doug (Justin Bartha) have happy lives at home -- but Alan (Zach Galifianakis) doesn't. Still lacking contentment and a sense of purpose, Alan has gone off his meds and surrendered to his natural impulses. It's up to the other members of the Wolfpack to get h

Steve and Eddie (Jaleel White, Darius McCrary) visit a gambling hangout to raise money after Eddie wrecks the family car.

Laura starts a campaign to have a black history course taught at her school.

Mary gets Pastor Jeff involved when Sheldon isn't invited to Billy's birthday party; George Sr. has male bonding time with Dr. Sturgis.

Sheldon fakes being sick to avoid a swim test at school; Dr. Sturgis spies on Meemaw's new boyfriend.

George Sr. and Meemaw struggle to manage the Cooper household; Mary plans Pastor Jeff's wedding.

Sheldon learns to listen when an emotional Paige struggles with her parents' divorce; George Sr. is furious when Georgie tries to buy his way out of chores.

George Sr. and Georgie go camping with Meemaw's new boyfriend, but things get complicated when her ex-boyfriend tags along; Sheldon and Missy invent a game.

Sheldon and Georgie mine for platinum in roadside gravel; Mary is concerned when Missy misuses religion to help with a batting slump.

Two days before his wedding, Doug (Justin Bartha) and three friends (Bradley Cooper, Ed Helms, Zach Galifianakis) drive to Las Vegas for a wild and memorable stag party. In fact, when the three groomsmen wake up the next morning, they can't remember a thing; nor can they find Doug. With little time to spare, the three hazy pals try to re-trace their steps and find Doug so they can get him back to

Two years after the disastrous events in Las Vegas, it is now Stu's (Ed Helms) turn to walk down the aisle. Since his bride is from Thailand, Stu decides to hold the wedding there. Desperately hoping to avoid the mayhem of Doug's (Justin Bartha) bachelor party, Stu chooses what he thinks will be a safe option: an alcohol-free, prewedding brunch. But this being Thailand, and with Phil (Bradley Coop

It's been two years since the gang known as the Wolfpack narrowly escaped disaster in Bangkok. Now, Phil (Bradley Cooper), Stu (Ed Helms) and Doug (Justin Bartha) have happy lives at home -- but Alan (Zach Galifianakis) doesn't. Still lacking contentment and a sense of purpose, Alan has gone off his meds and surrendered to his natural impulses. It's up to the other members of the Wolfpack to get h

Amy and Sheldon host a Valentine's Day edition of Fun With Flags; Penny and Leonard wrestle with getting older; Howard and Bernadette make a discovery in their hot tub; Raj is torn between Emily and another woman.

The gang celebrates news of Bernadette's pregnancy by singing karaoke; Wolowitz's reaction to the pregnancy announcement worries Bernadette; Wolowitz believes he needs to make more money to support his growing family.

For the first time in nine years, the gang celebrates Sheldon's birthday -- surprising him with a special guest.

Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.

Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali goes all out with pregnancy gifts.

During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.

The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.

The group struggles through an awkward morning after Sheldon's mother and Leonard's father spend an evening together; Penny's family arrives.

Wolowitz has a meeting with Colonel Williams, a representative from the Air Force Department of Material Command.

Sheldon tries to stay awake with an energy drink as the gang races to finish its government project on time; Penny and Amy attend a gathering at Bert the Geologist's house; Koothrappali learns Bernadette's true feeling about her pregnancy.

After her apartment floods, Amy suggests that she and Sheldon move in together; Koothrappali finds out the gender of Howard and Bernadette's baby before they do.

Things do not run smoothly when Amy moves in with Sheldon, and Leonard and Penny have to intervene; Howard and Bernadette find unexpected guests at their house when they decide to cancel their vacation plans.

Penny learns there are fans of her performance in "Serial Ape-ist" when she and Leonard attend a Comic Con event; Amy hosts a brunch at Penny's apartment; Wolowitz makes an impulsive purchase.

When Dede's husband comes to town to bequeath her possessions to the family, Jay and Gloria feel sorry for him and invite him to stay with them while he is in town.

Hayley works to figure out the best time to give the family a Christmas gift they will never forget; Phil borrows the family Christmas tree for a house-showing; Jay, Gloria and Joe deal with unwelcome holiday visitors.