The NCIS team finds themselves involved in a city gang while investigating the death of a Marine, and Gibbs must face his past once again when he finds a message at the scene of the crime.

The pressure builds and tensions run high as contestants continue to vie for a coveted spot in the Top 36.

Adrianna's baby bump is the major topic of conversation among the gossip mongers of West Beverly High. Baby Daddy Navid continues to ignore her, while growing closer to Nika. Dixon freaks out when Silver gets a much too permanent symbol of their love. Meanwhile, Ethan's friendship with Rhonda continues to blossom.

Now that the contestants' partners are back at the ranch, those who've been working out at home will weigh in and see how they have fared away from the ranch. Then all the players compete in this week's "rope challenge", and later, an elimination leads to tension on one team when one player thinks her partner hasn't been pulling her weight.

J.D. goes on a vacation.

Dave and Julie's relationship comes under strain as Dave struggles with a series of betrayals.

The new interns have to perform in the Sacred Heart traditional comedy show, so J.D. and Turk offer them to write the sketches. Meanwhile, the Janitor watches Carla in a delicate situation, and Elliot and her interns Sunny and Denise argue about a patient.

Mike makes bird food in Payette, Idaho. Also, Mike milks venomous spiders in Yarnell, Ariz.

The German authorities interrogate Olivia in an attempt to locate Mr. Jones. Meanwhile, the team investigates a bizarre series of incidents where the victims' facial orifices close over, leaving them faceless corpses.

Rose tells Sage the truth about who their grandfather is, causing a confrontation between Laurel and the twins. Meanwhile, Will's dad decides to start a new magazine and Megan wants to contribute to the first issue, but the editor-in-chief is much harder to please than she anticipated. Also, Marco goes to drastic measures to win Keith back.

CBI goes to investigate the murder of a married woman, while in bed with her lover.

Edward Scanlon, from Scotland Yard, believes that Jack the Ripper has arrived in Toronto and wishes to help the police finally to apprehend him. Murdoch is quite the skeptic but when several woman are found dead in a similar manner as Jack the Ripper's seven victims, he starts to believe what Scanlon is saying.

When the traveling Buffalo Bill Cody's Western Extravaganza settles in Toronto, murders happen. Inspector Murdoch must investigate the crimes while his boss becomes enamored with Annie Oakley.

In a bid to change his luck, Aidan Stone writes a biopic about Sean. Kimber wants Christian to make her daughter look younger by using botox. A yoga instructor comes to McNamara/Troy and asks for a rather unusual procedure.

A man faking his identity and posing as a college student disappears and the team must decipher his secrets in order to find him.

While performing jury duty under one of her aliases, Parker concludes that someone is attempting to influence the trial's verdict.

Author of The Gamble: General David Petraeus and the American Military Adventure in Iraq, 2006-2008, Thomas Ricks

It's Leslie vs. the Dairy Consortium after too many of the jugs expire at the same time, which means a lack of dairy products from the store. Instead of getting upset, Leslie designs a way to restock the shelves.

Tonight Stephen welcomes oceanographer Robert Ballard

Matt becomes an emergency foster carer to Sam Kelly but it is harder than he imagined. Donte arranges an underground boxing match featuring Bolton.

A couple return to Wales after 17 years away to develop a 18th century folly in Newport.