The dismembered fingertips and teeth of a murdered Marine are discovered in the stolen purse of a pickpocketer, launching NCIS on a mission to find a cold-blooded killer.

The girls plan a surprise baby shower for Haley, and the guys participate in try-outs for Jamie's baseball team. Julian and Brooke decide they'd like to adopt a child, and Mouth helps Millie prepare for her first day of work.

At the school, Principal Figgins is worried about underage drinking and the glee club becomes involved in the program. However Coach Beiste and Will have some fun together.

Jim feels guilty after his actions inadvertently injure a bystander. The Watcher proposes to Katie, Chris steals the trilsettum serum and injects it into his crippled father, and Mr. Litchfield forces JJ to join the academic decathlon team.

A ball challenge that turns out to be much harder than it looks gives the winning team a big advantage at this week's weigh-in, which is especially valuable given that both a red line and a yellow line will result in two players going home. Trainers Bob Harper and Jillian Michaels try to teach their contestants to push beyond the limits they've set for themselves, while trainers Cara Castronuova and Brett Hoebel take their team for an intense workout at a Mixed Martial Arts gym owned by contestant Rulon Gardner's former trainer, retired UFC heavyweight champion Bas Rutten. Then a weigh-in filled with surprises is followed by two contestants leaving the ranch.

Melanie tries to spice things up with Derwin; Malik wants to put his life back in order but faces problems that are difficult to resolve.

After JoJo suffers amnesia while undercover as a drug dealer's girlfriend, the NISA gang must convince her alter-ego Vivian to help take the dealer down before he sells a dirty bomb to terrorists.

A customer pushes the staff to their breaking point with an endless parade of worthless items. Then, Ashley asserts herself when a woman brings in what she claims is rare music box. And, Ashley and Seth band together against an unruly customer.

Leona faces both a personal and public crisis when Gail ends up in the hospital and Andy leads a movement to unseat her as Chief.

Mike starts the show by cleaning out a boat's fish grinder on the Bering Sea and later debarks and processes wood to be used for a cedar log cabin.

After Deeks is shot during a visit to a convenience store, the NCIS team investigates whether robbery was the real motive or if someone was aiming to harm Deeks.

Virginia's cousin Delilah, who struggles to make ends meet, pays a visit to the Chance family unannounced, determined to claim her share of Maw Maw's whom she thinks died years ago estate. Further tension builds when Delilah admits she still has a crush on Burt.

At Jimmy's wedding, Marti and Savannah are really nervous about seeing Dan, given their uncomfortable past, but they're in for an awkward surprise when he shows up to the wedding with his new girlfriend. Vanessa and Derrick face the toughest decision of their relationship.

A young man is found savagely beaten to death in the Don Valley and Murdoch is called to the scene. It is soon discovered that the victim is Tom Meeks, a cadet at Fort York who was on a rigorous training course that teaches guerrilla warfare tactics. Murdoch decides to take a closer look at the military unit after another body is found. This victim's face was shredded in an obvious attempt to try to avoid identification. Murdoch's investigation leads to the uncovering of some very disturbing underhand medical practices that the soldiers apparently know nothing about.

When Lisa encourages Mike to meet with a young female colleague seeking professional advice, Mike hesitates but soon discovers that she is attractive, sports-savvy and able to hang with the guys. After meetings between Mike and his new friend become more frequent, Lisa is prompted to join them, and she and Mike are surprised by her unique proposition.

Toby helps the IIB to investigate an assassination threat against a Conservative leadership frontrunner and high-ranking military official who might be involved in an incident years ago in Afghanistan.

Sammy Bryant looks for answers to his problems in the desert, as Detectives Adams and Ochoa babysit an important alcoholic witness before a murder trial. Officers Cooper and Sherman disregard standard procedure to help a needy child.

Tosh asks why girls are so bad at sports, as he helps a couple fallen high school athletes train for the Tosh.0'Lympics.

Diane represents her on-again, off-again love interest, ballistics expert Kurt McVeigh, when he is sued for testimony he gave in the murder trial of an accused cop killer who was recently exonerated. Meanwhile, Eli has a personal interest in Natalie Flores, Wendy Scott-Carr's illegal nanny.

Crosby pays the price for his mistake. Adam gets annoyed with Alex's visits. Meanwhile, he and Kristina have to deal with a huge problem that will affect Max's progress. Elsewhere, Drew gets some disappointing news from Seth, while Sidney makes a decision that her parents are very supportive of.

Erica, seeking revenge against Anna, heads to Hong Kong to carry out a mission to strike a lethal blow against Anna. Meanwhile, Anna learns that Tyler's phosphorous level is too low - even after the Red Rain - and he might become useless to her; and Lisa and Diana bond, beginning to form an alliance against Anna.

US Marshals ask Peter and Neal to help them find the FBI agent who is leaking witness locations.

As the fight with Morales nears, Lights finds himself at a crossroad in his life and career. He is about to attempt a comeback both in the ring trying for his 36th win, and at home trying to gain the support of his family. But when he asks Theresa to be in his corner for the fight, he instead gets unwanted support from an unlikely ally.

The challenges were military style- the M1A is utilized in the team challenge, while the Glock 17 is used to shoot obscured targets in the elimination round.

Anderson Cooper

Matthew Perry, Mike "The Situation" Sorrentino, Jason Aldean

Bing West

Amy Poehler

Owen Wilson, Rachel Maddow, Anberlin

John Waters, Malin Akerman

Ruby's political views find her in trouble after a new Polish caretaker arrives at the school. Cesca is finding it even harder to resist Jonah's charms. Janeece and Ronan clash over a stolen test paper. Bex attempts to return to normality despite Hodge being around.