After an impulsive make out with Collin, Jenna resolves to end her infidelity before Matty finds out.

A visit from Ethel's more impressive sister leads her to drug and shave Malloy to pass him off as her child; Connie masquerades as her husband, Connor.

It's Halloween night, a busy time of the year for any police precinct. Amy detests the holiday, and is not thrilled when she has to don a costume to go undercover on street patrol with Charles. Back at the precinct, Jake bets Captain Holt that he can steal his Medal of Valor before midnight, which results in him bringing out some costumes of his own.

Boden's future with Firehouse 51 is on the line and McLeod keeps on him about his past wrongdoings, pushing him toward an early retirement. With Boden considering his options, McLeod calls on an unlikely candidate to potentially replace him as Chief. Meanwhile, it becomes clearer who the mole inside the firehouse is and everyone takes measures to make their disdain for him known. Meanwhile, Shay's social life is in full bloom and Arthur continues to take money from the struggling Molly's.

At Kenneth Hahn Park, the artists are asked to choose magical Norse runes to inspire a dark elf warrior character.

Frank has to find a way to rename his twins before they are baptized. Meanwhile, Torgeir and the boys find themselves facing serious consequences after they wreck a Ferrari. Sigrid appears to have a new love interest.

An elusive girl in a flower dress may hold the key to the mystery that brings Coulson and his team to Asia to rescue a young man with an unusual and dangerous power; and Skye has a secret that jeopardizes her relationship with the team right when they need her most.

DiNozzo returns to his Baltimore Police Department days when he sees a felony suspect from a 15-year-old case at the NCIS crime scene of a murdered petty officer.

Analyst Nell Jones joins the NCIS: LA team in the field when a former Navy officer’s girlfriend is kidnapped in exchange for Navy intelligence. Meanwhile, Deeks unknowingly breaks one of Hetty’s rules.

In an effort to reconnect with Cece, Jess throws a Halloween party at the loft. In an effort to change Schmidt's sullen behavior, the loftmates resort to "catfishing" him by pretending to be his childhood idol - actor Michael Keaton. Then, Schmidt makes a decision that could change the loft forever.

Shaw must stay close to a 10-year-old girl with highly developed surveillance skills when she is identified by the machine; Carter's mission could be exposed.

Aria, Emily, Hanna and Spencer crash the Ravenswood Founders Day Celebration after finding a clue in "A's" new lair that Ali may indeed be alive. Dressed in their finest Edwardian wear, the ladies hit the creepy cemetery party to find Ali before "A" can. But if Ali is truly alive, could the PLLs be leading "A" straight to their friend without knowing it? With Ezra lurking in the shadows, "A" may be closer than the girls realize. Meanwhile, Caleb heads to Ravenswood to help the girls and meets kindred soul Miranda along the way.

Triggers are pulled that strengthen the MC, but also threaten to destroy it.

Ezekiel tells Dean a group of angels is hunting Castiel. Dean and Sam race to find their friend before the angels do. Meanwhile, a homeless Castiel is trying to make his way through the city and comes across some unexpected surprises.

The teams learn that only one member's weigh-in will count for the week, and the representative is chosen by a roll of the die. Also: The players compete in a water-bucket race; a contestant receives a troubling health update; a player connects with a family member; and one of Season 14's child ambassadors revisits the show.

Stephen weighs in on lions and tigers, KFC invents the "Go Cup" and A. Scott Berg discusses his book, "Wilson".

Mindy's excited to join the guys for a "boy's night out" at MoMA, but quickly realizes she misunderstood their plans: They're not going to the museum, they're going to an MMA fight and Mindy couldn't be further out of her element.

The coaches complete their teams for the upcoming knockout rounds.