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Leonard and the guys buy a time machine prop from a classic movie; Penny tells the guys their obsession with comics and toys is pathetic.

Leonard devises a plan to eliminate his rivals when he, Wolowitz and Koothrappali all fall for Sheldon's twin sister, but his plan backfires when Sheldon decides to choose who his sister dates.

Penny learns that Leonard does not celebrate birthdays, so she plans a surprise party; Sheldon unexpectedly gets to live out one of his biggest fantasies in an electronics store.

When Leonard finally works up the courage to ask Penny out on a date, they each turn to Sheldon for advice.

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

After seeing Penny with a handsome new guy, Leonard rushes into a rebound relationship with Sheldon's nemesis, Leslie Winkle.

The Jokers are back playing lawyers, trying to convince unsuspecting focus group participants to sign off on ridiculous terms and conditions before they go in. Then they put their family businesses to the test by asking strangers if their radio ad is good to stay on the air. Later, one joker will be getting revenge in an elaborate punishment that the other two are really going to feel.

The Jokers' mothers visit as overprotective parents meeting a Joker's girlfriend; a Joker must convince a stranger to pose as his girlfriend for a Broadway outing with his mother.

Phil's job takes up a lot of his time; Luke has his friends over for a poker game; Gloria worries the baby is cursed; Cam hosts a funeral for the cat's imaginary wife.

When Cam's sister comes to visit, he tries to find a gentle way to break the news of his engagement; Phil and Claire decide to miss one of Luke's games; Gloria is in denial about needing glasses.

The adults struggle to make it to a hot new restaurant in time for the reservation Jay pulled a lot of strings to get.

Jay and Manny oppose Gloria's decision to hire a male nanny; Phil and Jay try to cheer up Frank; Mitch and Cam ask Pepper to help plan their wedding.

The family goes to the annual school fair; Phil and Claire each plan a separate surprise for their 20th wedding anniversary; Haley has an awkward encounter.

Claire encourages Jay to go to ClosetCon, where he is reunited with former colleagues; for the first time, Cam takes Lily and Mitch to the Tucker farm.

Steve writes a book and becomes a famous celebrity author, turning Stan into an unbearable stage parent.

As Stan continues to dominate the household, Francine finds herself idolizing a group of women who seem to have it all.

The Winslows have a battle-of-the-sexes bowling match. With JoMarie Payton-France and Reginald VelJohnson.

The Winslow family makes a music video for a television contest.

Rachel plans to open a restaurant when the local burger hangout burns down.

Rachel surprises Steve with an invitation to a candlelight dinner at her restaurant. With Reginald VelJohnson.

Ross struggles to maintain a long-distance relationship; Chandler's well-intended attempts to get Rachel a date seem to miss the mark; Monica's plan to assert some authority at her new restaurant goes awry.

Phoebe's brother (Giovanni Ribisi) asks her to carry a baby for him and his wife; Chandler gets lessons in love; Joey finds himself in a class struggle.

Phoebe undergoes an embryo implant procedure to become a surrogate mother for her brother and his wife; Monica and Rachel wager their apartment in a trivia game against Chandler and Joey.

Chandler has a hard time handling Kathy's new role, in which she pretends to have sex with a handsome man; Rachel is attracted to a customer when she's demoted to personal shopper; Monica decides that Joey's new place is built for entertaining.

A visit to a strip joint fails to cheer up Chandler; Rachel gets Ross to go to an opera; Charlton Heston finds Joey in a compromising position during a movie shoot.

Chandler runs into Janice, now divorced, and finds her more irritating than ever; Ross plays rugby to impress Emily; Monica tries to figure out what a mysterious electrical switch in her new apartment does.

Rachel throws Emily a phony going-away party so she can see Joshua outside of work; pregnant Phoebe craves meat.

Ross tells Emily (Helen Baxendale) how he feels about her; Chandler and Joey suddenly receive a free adult TV channel in their apartment; Phoebe gets some surprising news about her pregnancy.

Ross has concerns about Emily's interests; Rachel's plans for Joshua are upset by a late change of venue.

Ross tries to keep Emily from returning to London; Monica and Rachel attempt to win back their apartment.

Monica and Phoebe find life in wedding attire has its charm; Rachel asks Joshua for more spontaneity.

Rachel and Ross reminisce separately about when they dated each other; the friends get invitations to Ross's wedding, but not all of them are going.

Sheldon creates a monster when he introduces Penny to online gaming.

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

Sheldon and the gang are confused when a young grad student is attracted to him.

When Sheldon bans Penny from the apartment for a series of petty infractions, Penny vows to get revenge.

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

Leonard asks Penny for advice when his new relationship starts moving too fast.

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important teammate in an upcoming fighting-robot competition.

Sheldon develops a scientific procedure for making friends; Kripke controls a new supercomputer.

A preview of upcoming U.S. National Soccer team action.

From Harder Stadium in Santa Barbara, Calif.

Analysis and highlights from a U.S. national team soccer match.

At college, Sheldon decides to expand his responsibilities and become a dorm resident adviser; Meemaw and Dale make a sketchy business deal; Mary and George Sr. rekindle their romance.