A petty officer is gunned down in a billionaire's Ferrari and the investigation leads the NCIS team to discover a link to a man Gibbs was named after.

The sixth-round results show. Included: performances by Taylor Swift and Jason Mraz; and a dance featuring a modern twist on Marie Antoinette.

Sabrina asks Jimmy to spend some time with her gay best friend and his partner on Halloween, prompting Jimmy to convince Burt into doing some investigative work at a local gay bar. However, Burt starts spending a lot of time there, causing concern in Virginia.

With Halloween right around the corner, Zoe begins to notice some odd occurrences happening in her home. She is shocked to discover that the culprit is George, but she soon realizes that he may have a sleepwalking issue. Concerned for his safety, they decide to conduct a sleep study, forcing her to cancel her big plans with Wade. Meanwhile, the Mayoral race between Lavon and Ruby is close, and AnnaBeth comes up with an unusual plan that may help him clinch the election leaving Lemon feeling uneasy.

The knockout round continues, as the coaches pit two of their own team members against one another.

Kate gets invited to her hot neighbor's Halloween party, so BJ tries to help Kate break free and be someone completely out-of-character for the night. Meanwhile, Ben and Tommy decide to stay home and hand out candy to the trick-or-treaters in hopes that they'll meet some hot moms, but the night takes a turn when Tommy unknowingly eats some of BJ's "candy" from Amsterdam, and Kate bonds with Will, a single father.

When a CIA agent who worked with Sam Hanna over eight years ago seeks his help and is soon found dead of an apparent suicide, Hanna and Callen suspect foul play and a bigger conspiracy. Meanwhile, Deeks finds his inner "dog whisperer" with Kensi as the two go undercover and enter a dog show with a prized poodle.

Dave and Alex can't seem to agree on an apartment. When Penny needs a car, Jane negotiates for her. Max introduces Brad to the techniques for having a night out free.

Jess gets a job as a zombie at a haunted house, but is more frightened of her changing feelings towards Sam. Schmidt and Cece are perfectly matched in the costumes they're wearing, while Winston and Shelby are worlds apart in theirs. Nick gets a visit from a former college crush who shows her affection in a scary way.

Tia and Tamera visit the Bahamas to learn more about their ancestry.

The remaining three artists are tasked with creating Halloween-themed characters, which they then must have perform in a choreographed stunt show.

When the surgical interns are given an impromptu medical quiz with a chance to assist in surgery as the prize, only Emily and Cassandra are left standing. After an STD outbreak at a local high school becomes an issue, Emily reluctantly agrees to speak to a group of high school girls about safe sex. Meanwhile, Emily continues to try to forget about her feelings for Will, but finds the task easier said than done.

Halloween is June's favorite holiday, and even more so this year now that she is single! However when she discovers that Chloe plays elaborate Halloween "tricks" every year, June becomes consumed with stopping her before Chloe really hurts someone she might actually care about. Meanwhile due to a deep-rooted childhood fear of Halloween, James throws his annual Halloween "Positivity" Party.

When Josh invites Mindy to a Halloween party, Mindy stresses out about finding the perfect costume to impress him. Meanwhile, Danny and Jeremy leave work early to finally take their driver's license tests, much to Danny's embarrassment.

Challenges inspired by Halloween include tattoos given in the inside of mouths; and requests by the human canvases for dismembered bodies and zombies. Also: One of the artists finds himself in the hospital and fighting for his life.

Alliances are tested, while bonds are broken.

Daniel models his Halloween costume; and helps catch an internet monster. Also: a Web Redemption for a lovesick teen.

After receiving intel from Mossad warning that two suspected terrorists are planning to meet, Annie finds herself in a race against the clock to track down the meeting location before the targets get away.

Sheriff Lamb suspects Savino of kidnapping the son of a member of the Nevada Gaming Commission in order to fast-track a gaming license for The Tumbleweed. Meanwhile, when Savino's wife, Laura, comes out to Vegas to support him in a new venture, his promise that their family will be safe there is put in jeopardy when a ruthless hitman from Milwaukee arrives in town.

Mike is nervous about living with a baby; Todd steals Daphne's idea at work; Sophia considers Raviva's advice.

A controversy-courting church gathers at Brickleberry with Woody's permission, but Connie makes herself scarce due to her history with the group's policies, and in the process discovers a secret military installation.

Katey Sagal, extreme pumpkin carver Tom Nardone, Tommy Johnagin

Kate Hudson, Ken Burns, St. Vincent with David Byrne

John C. Reilly, Jenni "JWoww" Farley, Lifehouse

Jay Leno

With Pamela Jefferies in a coma following her vicious attack, Banks becomes more determined to find Rothwell's killer. Convinced a vital clue is staring him in the face, he resolves to learn more about Keith Rothwell and, against orders, questions MP Martin Fleming, putting him on a collision course with rival DCI Burgess. Meanwhile, the return of Tom Rothwell to the UK presents Helen with another suspect and an opportunity to put pressure on his family.

Ever since she was young, Indi Waterstone has dreamed about building a house inspired by nature. With her partner Rebecca, she's going to do just that, on the Isle of Skye.

Jamie needs to more quicly to lay down the law and protect his family from some gang threats. Somebody has been passing the gang inside information and Jamie neds to find out who it is. Avril continues to act as a rogue pharmacist despite Jackson's warnings. Frank and Dom are in competiton about the number of conquests they've made on the estate.