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A 28-year-old artist gets stranded in an expansive, untouched forest in western Ireland. Finding shelter, she unknowingly becomes trapped alongside three strangers who are stalked by mysterious creatures every night.

Steve accidentally transforms himself into Elvis, not Einstein, when an experiment flops; Carl and Harriette are appointed marriage counselors.

Richie's class takes a field trip to the police station with tour guide Carl trying desperately to keep the dull tour afloat; the class is impressed when he shows a criminal the dangers of his actions if he kills an innocent police officer.

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.

George Sr. is asked to help with the football team; Mandy discovers Georgie and Meemaw's secret business.

Sheldon's search for a comic book leads him to a breakthrough; Georgie and Mandy have an uncomfortable first encounter with her parents.

Sheldon's database invention puts him at odds with the university; the church takes issue with Meemaw's video store.

Sheldon considers dropping out of college to focus on building his database; George Sr. is frustrated when someone else gets credit for his football wins.

Mary struggles to make new friends; Mandy pushes Georgie to date another woman.

Ross invites an attractive paleontologist (Aisha Tyler) to a rooftop "Days of Our Lives" party being thrown by Joey.

Monica and Chandler run into an old acquaintance when they secretly go to a fertility clinic; Ross helps Joey woo the same professor (Aisha Tyler) he wants to date.

Monica and Chandler interview unsuspecting candidates, hoping to find the right man to father their baby.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

The gang heads to Barbados for a paleontology convention where Ross is the keynote speaker; David (Hank Azaria) prepares to propose to Phoebe, but ex-boyfriend Mike (Paul Rudd) is not yet out of the picture.

In Barbados, Monica, Chandler and Phoebe eavesdrop on their friends' passionate encounters; Monica styles her hair to look like a blowfish; Phoebe and Mike rekindle their romance.

Ross drinks too much alcohol at dinner with Rachel, Joey and Charlie; Frank Jr. (Giovanni Ribisi) cannot cope with his precocious triplets.

Rachel and Joey nervously anticipate their first real date; Monica and Phoebe try to avoid an obnoxious friend with a fake British accent; Ross emerges from a tanning booth with a two-toned appearance.

Rachel gets Monica and Chandler to delay their trip to Vermont for Emma's first birthday bash.

Rachel feels like her younger sister, Amy, is finally on the verge of making a major change in her attitude; in order to help Amy become a more responsible person, Rachel overrides Ross' strong protests and allows Amy to baby-sit Emma.

When Ross interviews with Charlie's ex-boyfriend (Greg Kinnear) for a prized grant, the doctor makes a shocking stipulation; Chandler lies about watching Joey's bizarre audition tape.

Monica and Chandler fuss over their apartment as they expect a visit from the adoption worker, Laura; Phoebe and Mike opt for a small wedding and donate the extra money to a children's charity.

When Amy doesn't have time to work on super-asymmetry, Sheldon goes to great lengths to ensure she's available; Koothrappali doesn't want Wolowitz to join him in hosting a show at the planetarium.

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.

Leonard is caught between a rock and a hard place when he becomes responsible for distributing extra grant money; Bernadette turns the backyard playhouse into a hideaway to get away from her husband and kids.

Sheldon tries to bond with Amy's father, but when Wolowitz lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler; Koothrappali and Anu try to get physical for the first time.

Sheldon and Amy are devastated after learning from a Russian paper that Super Asymmetry has already been discovered and disproved; Bernadette wants to beat Howard in a popular video game.

A VHS tape from Sheldon's past inspires him not to give up; Bernadette turns into a pageant mom when she tries to help Wolowitz with his Magic Castle audition.

Penny and Leonard organize a paintball game, which results in mayhem when Sheldon becomes jealous of Amy; Koothrappali catches Anu with her ex-boyfriend; Stuart doesn't want to move in with Denise.

Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.

Sheldon and Amy are thrilled when their super asymmetry theory is proven by two physicists, until they try to kick Amy off the Nobel nomination; Bernadette has a big success at work.

Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law; Leonard is disappointed when his friends exclude him from a scientific project.

Penny tries to throw a wrench into Leonard's plan to be a sperm donor for her ex-boyfriend; Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip aboard the "vomit comet.".

The gang uses deception and betrayal to make it to the one open seat at Wil Wheaton's celebrity Dungeons and Dragons game with William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith.

When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is left in charge of the kids; Sheldon finds a book about experimenting on kids.

When competitors Pemberton and Campbell charm America on a publicity tour, Sheldon and Amy try to win over Nobel laureates Kip Thorne, George Smoot and Frances Arnold; Halley's fear of the dark leads to opportunity and conflict.

Pam and Jim work on their first joint sales pitch; Michael misreads body language; Dwight encourages Kelly to try out for the minority training program.

Michael thinks his girlfriend is cheating on him and asks Dwight to investigate; Andy becomes frustrated when no one takes his customer's complaint seriously.

Michael is surprisingly cheerful after learning bad news about Donna; new parents Pam and Jim have a hard time staying awake at the office; Dwight refuses to honor a contract.

When the press learns that Sabre's printers catch on fire, Jo tries to find out who the whistle-blower is.