Christine mistakes a hot cop for a stripper and New Christine goes into labor.

Pete goes to rehab and finds himself unable to avoid misadventures as his old friend Machine Gun Kelly shows up intent on getting him high. Meanwhile, Pete's sister Casey is set to graduate without him there.

Rachel enlists Julia as her 'sex mentor'. Aaron and David break into Samson's house.

Charlie returns to his bachelor lifestyle after Alan moves out of the house whilst Alan suffers a breakdown after his divorce from Kandi.

Charlie finally tells Alan the truth about why he did not marry Mia and they both have to deal with a noisy neighbour.

Molly and Peggy try to play nice for Mike's birthday.

Mike and Molly take up roller-skating before having kids.

Mike goes on a junk food binge while Molly's away.

Max and Caroline take a vacation from their lives when they are asked to dog-sit at a couple's posh apartment.

In an effort to raise money to help Caroline's father, Max convinces Caroline to partake in a clinical drug trial.

Caroline promises Earl that she will drop his tax return in the mail, but when she learns that Max has never filed her taxes, she gets sidetracked trying to help Max.

The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy.

In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.

Wil Wheaton interviews Sheldon for a Star Trek documentary where he reveals the ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the topic of starting a family together with Howard is brought up.

Joey has a dream about Monica. Phoebe finds a police badge under her seat at Central Perk and uses it to go on missions of mercy. Ross buys a sofa but has trouble moving it up the stairs into his new apartment.

Rachel starts smoking in order to avoid missing meetings with her boss. Ben gets offered an audition for a commercial and Joey auditions to be Ben's father. Monica and Phoebe plan a party for Rachel but Monica takes over.

Joey lands a role in Law And Order and his Italian-speaking grandmother comes over to watch his network debut. Meanwhile, Ross tries unsuccessfully to flirt with the pizza delivery girl.

Molly and Peggy try to play nice for Mike's birthday.

Mike and Molly take up roller-skating before having kids.

Mike goes on a junk food binge while Molly's away.

Max and Caroline take a vacation from their lives when they are asked to dog-sit at a couple's posh apartment.

In an effort to raise money to help Caroline's father, Max convinces Caroline to partake in a clinical drug trial.

Caroline promises Earl that she will drop his tax return in the mail, but when she learns that Max has never filed her taxes, she gets sidetracked trying to help Max.

The guys take a fencing lesson from Barry Kripke and Sheldon finds himself in an awkward position when Kripke expresses interest in Amy.

In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man.

Wil Wheaton interviews Sheldon for a Star Trek documentary where he reveals the ring and his plan to propose to Amy. Bernadette wants to start renovating the house and the topic of starting a family together with Howard is brought up.

Joey has a dream about Monica. Phoebe finds a police badge under her seat at Central Perk and uses it to go on missions of mercy. Ross buys a sofa but has trouble moving it up the stairs into his new apartment.

Monica and Chandler try to prove they're more hot and heavy than Phoebe and Gary. Rachel accidentally kisses her job interviewer at Ralph Lauren. Joey tries to meet a girl living in Ross' building but Ross meets her first.

Rachel starts smoking in order to avoid missing meetings with her boss. Ben gets offered an audition for a commercial and Joey auditions to be Ben's father. Monica and Phoebe plan a party for Rachel but Monica takes over.

Joey lands a role in Law And Order and his Italian-speaking grandmother comes over to watch his network debut. Meanwhile, Ross tries unsuccessfully to flirt with the pizza delivery girl.

Molly is so focused on directing a school recital that she doesn't notice a fellow teacher hitting on her.

Mike and Carl get stuck working at the Renaissance Faire after their boss, Captain Murphy, gets dumped by Mike's mother.

Molly finds herself at a crossroads with her career and makes a huge decision to leave teaching to become a writer.

Max's babysitting gig with Peach is in peril if the cupcakes she and Caroline deliver to Peach's socialite friend aren't perfect.

Max and Caroline use Caroline's invite to a Manhattan gala as a means to meet MARTHA STEWART and present their cupcake business.

Max and Caroline use Caroline's invite to a Manhattan gala as a means to meet MARTHA STEWART and present their cupcake business.

Sheldon, Wolowitz and Koothrappali post an online advertisement to find Sheldon a new girlfriend. Also, when Amy is coy with details about a guy she is dating, Penny and Bernadette decide to spy.

Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily.

Sheldon has a revelation when he realizes why a song was stuck in his head. Also, Amy invites Dave over for dinner despite their previously awkward date.

The guys get invited to take a ride along with Gary as a means to keep Ross distracted from Emily's upcoming wedding. However, when they hear a gun shot, Joey throws himself over Ross which makes Chandler jealous.

Gary asks Phoebe to move in with him but she's reluctant to and to overcome boredom, Ross and Joey start throwing a ball to each other. Rachel buys an expensive cat but it doesn't behave as she hoped it would.

Joey seems to have hit it big when he gets offered a lead part in a movie shooting outside of Las Vegas. However, when Chandler begins expressing doubts about the film's legitimacy it causes a rift in their friendship.

Chandler decides the only way to mend his friendship with Joey is to fly out to Vegas and visit him. Phoebe is determined not to be left out on another adventure, so everyone winds up going.

Carpet salesman Glen faces chaos when his estranged brother Lee turns up unexpectedly and starts to disrupt his ideal suburban life.

Kirsty encourages Glen to organise a Chinese meal to impress his boss Ian. Meanwhile, Lee is still determined to track down their dad’s old pal - their “uncle” Steve.

Charlie tries to surf to impress Dottie, a beautiful woman he just met, but after he nearly drowns he's convinced he saw his late father.

Alan tries to hire his ex-wife's lawyer to help him win custody over the dog he and Kandi shared.

Christine feels intellectually inferior after meeting Max's friends at their "surprise" engagement party, driving her to make a decision.

Max's babysitting gig with Peach is in peril if the cupcakes she and Caroline deliver to Peach's socialite friend aren't perfect.

Max and Caroline use Caroline's invite to a Manhattan gala as a means to meet MARTHA STEWART and present their cupcake business.

Max and Caroline use Caroline's invite to a Manhattan gala as a means to meet MARTHA STEWART and present their cupcake business.

The guys get invited to take a ride along with Gary as a means to keep Ross distracted from Emily's upcoming wedding. However, when they hear a gun shot, Joey throws himself over Ross which makes Chandler jealous.

Gary asks Phoebe to move in with him but she's reluctant to and to overcome boredom, Ross and Joey start throwing a ball to each other. Rachel buys an expensive cat but it doesn't behave as she hoped it would.

Joey seems to have hit it big when he gets offered a lead part in a movie shooting outside of Las Vegas. However, when Chandler begins expressing doubts about the film's legitimacy it causes a rift in their friendship.

Chandler decides the only way to mend his friendship with Joey is to fly out to Vegas and visit him. Phoebe is determined not to be left out on another adventure, so everyone winds up going.