The remaining contestants travel to Mexico, where one geek comes out of his shell and another is pushed to limits. For their challenges, the beauties must face each other in a memory competition while the geeks compete for immunity in a dance-off. Finally, a new twist promises to turn the competition upside down.

The team suspects their own colleagues after the burnt remains of an intern at the Jeffersonian are found in the building's incinerator. At first it's thought that she might have been killed because she was working on an artifact in the Widow's Son case, but then things become more complicated when romantic ties between her and another employee at the Jeffersonian surface. Meanwhile Booth poses as Cam's boyfriend on one of her family get-togethers.

Based on practically no information and no medical history about a mystery patient sent by the CIA, House is using some unorthodox methods to diagnose and treat him. Meanwhile the remaining candidates are questioning Foreman's judgment.

Gibbs finds himself emotionally challenged when he agrees to investigate a crime connected to a friend of his daughter, who was killed years ago, and the investigation leads to a shocking conclusion.

Eddie goes into protective mode when Tay is threatened by a gang member, and Cassie is disturbed when she hears that Charles was injured in a car accident.

Joel gets a new Homo Sapien friend, Jake, but Nick suspects he's a caveman trying to blend in. Also, Nick considers Jake to be a shaver, a person who shaves his body hair to differentiate himself from cavemen. Meanwhile, Thorne is attracted to the beast in Andy.

Seventh-round results. Also: LeAnn Rimes performs "How Do I Live" and "Nothin' Better to Do".

The teams go green and learn how to incorporate environmentally friendly habits in their lives. This week's physical challenge also incorporates recycling, with the winners receiving Ford Escape hybrids.

The early years of the space race are recalled, including the Soviet launch of the Sputnik I satellite on Oct. 4, 1957; the failed U.S. attempt to launch a satellite eight weeks later; and the contributions to the American space program by Wernher von Braun, who had led Nazi Germany's rocket program. Also: comments from the National Air and Space Museum's Roger Launius and Michael Neufeld; and National Reconnaissance Office historian emeritus R. Cargill Hall.

Sam and the crew go after a thrill-seeking pair of escaped souls that engineer car wrecks to keep their relationship fresh. Meanwhile, the Devil tries to set Sam up with a new girl.

Mike rolls up his sleeves and gets dirty in order to help create an artificial underwater reef. Reef balls help to revitalize fish and coral populations in areas that have been devastated by pollution.



Then Mike goes to Texas to learn how to make soap out of goat milk.



Finally, Mike travels to Louisiana to refurbish frack tanks used for water storage.

Laird hooks up with his crazy ex-wife, which proves to be a disruption to the carpoolers' lives. Meanwhile, Dougie and Cindy renew their vows in order to forget how terribly their first wedding went.

Denny angers the senior partners when he fires an associate for being fat, consequently bringing a large lawsuit against the firm.



Alan enlists the help of Whitney in the case of Patrice Kelly whose temporary insanity plea is not going over well with the jury in her murder trial.



Meanwhile, Jerry helps a client who shares his affliction of Asperger's syndrome and begins to show some affection.

Benson comes under fire from fans of a convicted serial killer after a body turns up that greatly resembles his work.

Sean and Christian learn about the glamorous side of fame and the price that many are willing to pay for it. Julia visits Sean, Christian and Liz in Los Angeles with a surprise announcement.

The Unit is in Lebanon when Charles is seriously wounded. They must think and act quickly to save his life.



On the Home Front, Tiffy's problems continue to build when a man she met at her job tows her car. The women stand up and fight to protect her.

Pancho finally reveals the truth about Lucia's death to Frank. Meanwhile, while coming up with a plan to save the rum company, Alex discovers incriminating evidence about the Samuels.

Lunuganga catches Ichigo and the others by surprise and sucks them underground. They awake to find themselves surrounded by Hollow with Rukia missing. Suddenly, they are joined by a whole group of Menos Grande. Meanwhile, Rukia wakes up and has similar encounters with Hollows. She escapes only to find a couple of Menos herself. A strange figure with a mask appears to save her. Just who is this unknown person who wields a zanpakutou?