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Realizing Leonard is the center of the gang, Sheldon seeks to form a new group of friends of which he can be the center.

Katherine's mind games are getting on everyone's nerves, but Damon, Stefan and Elena realize that her knowledge of Mystic Falls history will help them stay alive. Frustrated with her relationship with Matt, Caroline finds a new way to get his attention. Alaric makes a surprising confession to Jenna, and Katherine makes a different kind of confession to Damon. Stefan and Bonnie try to convince Jonas and Luka that they should all be working together, but Jonas' lack of trust leads to a violent and fiery confrontation.

Greendale prepares for the Vice President's visit. Dean Pelton organizes the first student elections, putting Annie against Jeff, Leonard and Star Burns. Meanwhile, Abed develops a friendship with special agent Robin Vohlers.

When Jeff proclaims it's 'Jeff Day', he gets his way until the cleaning lady arrives. Meanwhile, Adam has to figure out why his eye is twitching.

When Leigh's injuries prevent her from participating in a doubles tennis tournament with Rex, Julia steps in as her replacement. Dave, Vance and Isabella set up shop in one of the houses they're selling until Amy spoils the fun.

The team investigates two apparent corpses who aren't exactly dead at all.

Meredith must choose between her fertility treatments and her eyesight when she begins having trouble seeing, Mark makes it clear to Callie and Arizona that he takes his role as father-to-be very seriously, and April discovers there's more to Dr. Stark than first appears.

Todd is ready to stop being a travelling salesman and wants to take a desk job in Scranton. Andy deals with a glitchy computer and Pam's hesitance to get him a new one.

Bear puts his ingenuity to the test making a seal skin into a wetsuit and finding shelter from the harsh elements on Scotland's Cape Wrath.

Hank believes his patient has been previously misdiagnosed and is determined to find out what he really has. Meanwhile, Divya and Raj prepare for their upcoming nuptials by taking dance lessons, but wind up as patients.

Hoping to speed up her recovery, Amanda sedates Alex after her most recent mission and takes advantage of Alex's drugged condition to question her about the secrets Amanda suspects Alex is hiding. Realizing Alex is in danger, Nikita works to secure her another identity to smuggle her out of the country.

Ron and Leslie take a road trip to the big city in order to visit Ron's favorite place which happens to be a steakhouse, but Leslie has alternative motives for the trip.

Jack puts Liz in charge of an event for Angie in the hopes that she can emotionally manipulate Angie into making an appeal to Tracy. The "Queen of Jordan" cameras bring Jack some embarrassment while leaving Jenna starved for attention. A lost love returns to Frank's life, causing him to question his maturity.

Couples therapy reveals secrets that Charlotte and Copper must deal with, whereas Violet needs approval from her fellow doctors when it's revealed that her novel will make everyone's personal lives public. Meanwhile, Sheldon's patient claims multiple personalities, and Sam and Naomi's patient is a teenager with Down 's syndrome who's pregnant.

Evidence in the murder of an antiques dealer found dead in a museum indicates that the suspect may be a member of the CBI team.

When members of Woodhouse's famed WWI Royal Flying Corps squadron start dying mysteriously, Archer tries to track down the killer.

Snooki's summer of hookups comes back to trouble her. The Situation pulls a huge prank on Deena and Snooki. But the other guys have the final laugh when they ditch The Situation for taking his time getting ready for dinner.

Kate mediates between Marcus, a frustrated inventor, who's being fired and his employer who holds the rights to his latest invention. When Marcus takes the device and threatens to jump to his death, Kate must find a fair resolution for everyone.

When one of the call center workers quits, Todd is excited to have the opportunity to hire a new employee. After interviewing numerous unqualified candidates, Todd finally finds a diamond in the rough. However, Todd's happiness is short-lived when he finds out that someone close to him has poached his new recruit.

Austan Goolsbee

Stephen Merchant, Kumail Nanjiani

Mike Huckabee

Sen. Rand Paul, Bright Eyes

Meredith Vieira, DJ Pauly D

Forest Whitaker, Teresa Palmer

Fluttershy can take care of all animals, no matter how wild, but when she offers to take care of Apple Bloom and her friends Scootaloo and Sweetie Belle, it's an entirely different story. Will Fluttershy stand up to the challenge, and will she do it with or without 'The Stare'?

Guests joining Graham on the show this week are Matthew Fox, Diane Kruger and Jessie J.