Caroline drags Max to a cake-decorating class to increase their skill level and learn how to make more attractive cupcakes for their business.

In desperate need of a new apartment, Abby turns to Gurgs and her unconventional real estate skills.

Gurgs's tween nephew and some of his fellow students visit the court for a school project.

Alan is sure that things will turn bad when Charlie starts dating his receptionist.

Upon discovering Miss Pasternak, Jake's former 5th-grade teacher, turned to stripping after their fling, Charlie tries to help her turn her life around.

Walden risks losing Louis when his secret with Alan gets out.

Walden joins a group for adoptive fathers - without Alan.

Alan breaks up with the social worker to be with Lyndsey.

Lexie confesses to Sue that she has a crush on Axl.

Axl runs into just about all of his ex-girlfriends at a part.

Brick spends a weekend with Axl at college to par-tay!

Amy starts working at Caltech which causes friction with Sheldon. Howard agrees with Sheldon who mentions this to Bernadette causing a big fight for the Wolowitzes.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud and a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When Monica's credit card is stolen she ends up making friends with the thief. Ross discovers Marcel has reached sexual maturity and needs to be with his own kind, so he tries to get him into the "Harvard" of all zoos.

After losing his virginity to her, Monica's boyfriend reveals he's a high school senior. Rachel has erotic dreams about Joey & Chandler. Whilst temping, Phoebe discovers no one at Chandler's office likes him anymore.

Carol goes into labour and Ross and Susan can't stop bickering over who gets to help more. Rachel flirts with an OB/GYN who has a love-hate relationship with women's private parts and Joey ends up assisting a birth.

During Rachel's birthday party, and while Ross is in China, Chandler lets it slip that Ross is in love with her. Joey's girlfriend wants to sleep with him but his participation in a fertility study is preventing this.

Walden risks losing Louis when his secret with Alan gets out.

Walden joins a group for adoptive fathers - without Alan.

Alan breaks up with the social worker to be with Lyndsey.

Lexie confesses to Sue that she has a crush on Axl.

Axl runs into just about all of his ex-girlfriends at a part.

Brick spends a weekend with Axl at college to par-tay!

Amy starts working at Caltech which causes friction with Sheldon. Howard agrees with Sheldon who mentions this to Bernadette causing a big fight for the Wolowitzes.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud and a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

When Monica's credit card is stolen she ends up making friends with the thief. Ross discovers Marcel has reached sexual maturity and needs to be with his own kind, so he tries to get him into the "Harvard" of all zoos.

After losing his virginity to her, Monica's boyfriend reveals he's a high school senior. Rachel has erotic dreams about Joey & Chandler. Whilst temping, Phoebe discovers no one at Chandler's office likes him anymore.

Carol goes into labour and Ross and Susan can't stop bickering over who gets to help more. Rachel flirts with an OB/GYN who has a love-hate relationship with women's private parts and Joey ends up assisting a birth.

During Rachel's birthday party, and while Ross is in China, Chandler lets it slip that Ross is in love with her. Joey's girlfriend wants to sleep with him but his participation in a fertility study is preventing this.

Alan hesitates when Lyndsey asks him to move in with her.

Walden offers Alan a divorce gift of his choice.

Charlie Harper is alive. Or is he? Find out in the two-part finale.

Brick finally meets the boy he was switched at birth with!

Mike threatens to get rid of the pool if no one's using it.

Frankie searches the house for Axl's missing graduation gift.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.

Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.

Leonard and Amy help Sheldon cope with the shame he’s feeling after his accidental contribution to science is disproved. Meanwhile, Raj must stay with Howard and Bernadette for a week.

Rachel waits patiently at the airport for Ross, not knowing he is returning with his new girlfriend, Julie. Desperate and upset, Rachel spends the night with her old lover, Paulo, the Italian stud.

The guys are uncomfortable with Carol breastfeed and Rachel is uncomfortable with Monica's growing friendship with Julie. Joey competes with a fellow cologne spritzer for the affections of a beautiful colleague.

After Mr. Heckles dies, leaving all his belongings to Monica & Rachel, Chandler discovers eerie similarities between the late eccentric man and his own life. Ross & Phoebe have a dispute over the progress of evolution.

The gang is amazed to learn Phoebe married a gay Canadian ice dancer to help him get his green card. Ross seeks relationship advice from Rachel after revealing he and Julie have yet to consummate their relationship.

Glen steps up as acting manager of World of Carpets and starts to love the power it gives him, until his colleagues put him in his place.

Glen reels from the repercussions of the fight club and at World of Carpets, Glen’s promotion is jeopardised by a drunk Ian.

When Judith kicks Herb out of the house, Alan hopes to reconcile with her. Meanwhile, Herb tries to adopt Charlie's bachelor ways.

Alan tries to get away from Judith. Meanwhile, Charlie and Herb go out on the town and Charlie uses the threat of military school to get Jake to do chores.

Caroline and Max walk into a hoarding nightmare and end up waist-deep in clutter when they take a job cleaning an apartment to make extra money. Plus, Max discovers that Johnny has been keeping a secret from her.

Brick finally meets the boy he was switched at birth with!

Mike threatens to get rid of the pool if no one's using it.

Frankie searches the house for Axl's missing graduation gift.

Rachel waits patiently at the airport for Ross, not knowing he is returning with his new girlfriend, Julie. Desperate and upset, Rachel spends the night with her old lover, Paulo, the Italian stud.

The guys are uncomfortable with Carol breastfeed and Rachel is uncomfortable with Monica's growing friendship with Julie. Joey competes with a fellow cologne spritzer for the affections of a beautiful colleague.