One hundred competitors attempt the most-difficult obstacle course.

Part 2 of 6. One hundred athletes face Stage 1 in Las Vegas.

Part 1 of 2. Khloe returns to Los Angeles due to increasing demands on her time from her family. Meanwhile, Scott tries to behave when he attends a sweet-16 birthday party in New York.

Jason is disturbed by a dream; Bill and Eric hope Sookie will help them look for Russell Edgington.

A faulty oil rig leads to the death of an engineer; Parker's ex-wife fights for sole custody of their son; Jane battles uncertainty about where Owen is and what it means for their upcoming nuptials.

The murder of a woman who contacted the Innocence Project to exonerate a death row inmate now forces Jim to team up with the detective who investigated the original case: Jim's former partner when the Florida State Attorney General's office calls her to testify against the IRS agent who handled her audit and tried to extort her for sex a few years back. Reluctant to take time off to help the State Attorney, Callie is surprised when Miranda is not only supportive of her request, but also learns that Miranda has been the victim of sexual harassment herself, and the two women bond through their shared experience.

A familiar person returns to the unit, but his motives are scrutinized. Elsewhere, a captured skitter is imprisoned at the camp, and Hal connects with Maggie as she casts light on her past.

Kagame pursues step one of his new agenda - win the intellectuals and the grass roots dissenters. When the CEO of a major corporation is kidnapped by Liber8, Kiera and Carlos have to race a literal ticking clock in order to save the CEO from having the public extract their pound of flesh.

It s time for drivers to step up or step out of the game. With tension on the road at the breaking point, one driver will walk away. Austin is tasked with the biggest load of the season so far: an entire cabin, balanced precariously on an oversized trailer. The news of Austin s entry into the world of heavy haul rubs Jack Jessee the wrong way. But even with a regular load of freight, the Dalton proves to be a challenge for Jack when he battles oncoming traffic on a slick section of road. Carlile boss Lane Keator makes the call to put South Carolina native Porkchop in a convoy with Darrell Ward, hoping that Porkchop will learn something from the Montana log hauler. On the Dempster, Alex races up the road before the gathering snow shuts everything down. Hugh and Rick s cement truck haul goes awry, putting the boys at odds with the law. After days of struggling to reach Red Sucker Lake to deliver their loads, now they re just hoping to stay out of jail.

Part 3 of 6. One hundred athletes face Stage 1 in Las Vegas.

Andy makes his intentions known to Jill. Doug is presented with an enticing investment opportunity. While Nancy recuperates, Silas helps her with a new business venture. Shane figures out who shot his mother.

Claudia Joy helps retired veterans with their legal problems; Roxy worries about Cody's depression; Trevor urges Hector to see a marriage counselor; Nicole gets upset when Charlie breaks the news of their engagement to Nicole's unsupportive mom

Will's apology for the lack of integrity in newscasts sets off constant critiques of the Tea Party before the November 2010 midterm elections, but draws the ire of network executives and Atlantis World Media CEO Leona Lansing. Meanwhile, Don confronts Elliot about his analytical skills; Jim helps Maggie during a panic attack; and Mac is unnerved by Will's endless parade of romantic conquests.

When a convicted murderer is released early due to overcrowding and then found mauled by a bear, the list of suspects is long. Walt suspects someone baited the bear to attack so the team sets out to track down the bear and the person who used the bear to commit murder. Branch's uncle is taken into custody when he fires his shotgun in his retirement home.

Eric Andre and Hannibal Burress were joined by J-Moe.

The guys pursue new careers outside of Dethklok. Pickles opens a winery, Nathan and Skwisgaar search for a new sound, and Toki and Murderface get into politics.

Celebrate pizza and pasta with a super-sized challenge. The four best cooks from the previous challenge compete against each other for the chance to cook off for an Immunity Pin.