Samuel prepares for new additions to his family, while Lydia warns him of the consequences. Claire discovers that her roommate Gretchen may have a hidden agenda. Meanwhile, Peter finds an unexpected way to connect with Emma, who would prefer to stay distant. Elsewhere, a different side of Sylar emerges as he desperately tries to remember the person he used to be.

A wealthy businessman brings his teenage son, who is suffering from inexplicable stomach pains, to Princeton Plainsboro and insists on having Dr. House handle the case. The father of the patient believes the karmic penalty of his financial success is that he is victim to personal tragedy, and that the answer to his son's medical mystery lies in a reverse of fate rather than medical treatment. Meanwhile, Foreman and Chase prepare to present information on the Dibala case.

Marshall and Lily want to hook up with Barney and Robin for double-dating and fun, but their desperate eagerness to please is a huge turn-off. Meanwhile, when a succession of girls come to his apartment and immediately fall asleep, Ted is bummed to learn he is a "Sexless Innkeeper" whose "dates" are only interested in a comfy place to crash.

Haley finds herself in the spotlight as Nathan's sex scandal grows. Meanwhile, Brooke allows Julian to keep working with Alex; Millicent lands a new job; and Clay and Quinn grow closer.

Charles depression over his new family threatens to take over his life.

Host Alton Brown helps an average Joe overcome his kitchen phobias and whip up the classic breakfast of bacon, eggs and coffee.

Amaar thinks Reverend Thorne is stealing his sermons but his idea to prove this threatens to backfire on him.

Billie and Zack agree to see other people. However, this proves to be easier said than done when Billie's pregnancy gets in the way of both of their potential dates.

Alan starts working for Evelyn as Charlie works to fix the relationship between Chelsea and Jake.

Casey's detective skills inadvertantly start a brawl between the Kappa Tau's and the Omega Chi's. Meanwhile, Rusty, Calvin, and Dale take a trip to Comic-Con as Ashleigh and Fisher resume their relationship but still have a few issues.

Lily and Rufus decide to move up their wedding to the next day, but will someone or something come between them before they become man and wife? Chuck discovers a secret that Carter has been keeping from Serena. Dan and Vanessa are pulled into one of Georgina's schemes. Blair is suspect of Bree and shares her concerns with Nate.

While in Mexico, Lightman and Emily work on a case involving a missing American woman. Back in the States, Foster looks into tainted blood in D.C. hospitals.

Boone's relationship problems are forced to be put on hold when a gunman goes on a rampage inside an office complex. The shooting causes Rabbit and Nancy to have to work together for the first time in over a year. Meanwhile, Marisa realizes how similar she is to Rabbit.

The fourth week of performances has begun. Four new dances are added and the pairs have to dance to Lambada, Charleston, The Two Step or Bolero.

Facing a return to India, Raj needs a job desperately enough to consider working for Sheldon. Meanwhile, Howard becomes a third wheel to Leonard and Penny.

Horatio and the team investigate a billionaire's death when they found out he is guilty of stealing the assets of his investors and their companies.

When an Arctic explorer is killed during a polar expedition, the mysterious circumstances of his death take Castle and Beckett from the penthouses of Park Avenue to the halls of the CIA. But Castle's delight at the case's many twists and turns soon turns to frustration as he realizes that their elusive killer might just be fooling them all.

Comic Dana Carvey; singer Justin Timberlake are Jay's scheduled guests.

Guest: Secretary of Homeland Security Janet Napolitano.

Shashi Tharoor, Dr. Sanjay Gupta

Garry Shandling, Kaley Cuoco, Tim McGraw

Jamie Foxx, Jason Alexander, Grizzly Bear

The shinigami discuss Byakuya's betrayal, and the discovery that if a zanpakuto is killed by anyone other than its owner, it will be unusable. Byakuya returns to the zanpakutos' hideout, and proves his loyalty by defeating and seemingly killing Sode no Shirayuki, leaving Rukia unable to use her zanpakuto. Rukia and Renji investigate Byakuya's office, but Byakuya arrives with Senbonzakura, tossing Rukia the broken remains of her zanpakuto. Zabimaru arrives to help Renji fight Byakuya and Senbonzakura, but they are overpowered and several zanpakuto, including Tenken, Houzukimaru, Wabisuke, Rurio Kujaku and Gonryomaru, arrive. The Second Division surrounds the zanpakuto, the zanpakutos' owners come out to fight them, and Ichigo confronts Byakuya.

Alcohol is by far the most widely used drug - and a dangerous one at that. So why are so many of us drinking over the recommended limits? Addiction expert John Marsden, who likes a drink, makes a professional and personal exploration of our relationship with alcohol. He undergoes physical and neurological examinations to determine its impact, and finds out why some people will find it much harder than others to resist alcohol.

So that he can prove to Sam and Eddie that he's fit Don decides to join a local gym. Don finds it much harder than he thought and passes out after a go on a running machine. After he decides that the gym isn't for him he decides to have colonic irrigation instead.