The last 12 of the top 36 acts take the stage of Radio City Music Hall to perform for America's votes.

Santanico and Richie are outside Houston, living like Bonnie and Clyde; Seth and Kate are scraping by South of the Border; and Freddie Gonzalez is protecting his wife and young daughter in a Houston suburb. And Carlos Madrigal and Scott Fuller emerge from the Titty Twister, changed men. They will all come together once again - this time facing off against an even bigger threat.

Jamie contacts a fellow journalist in an attempt to expose the truth about Reiden's involvement in the global animal problem. After realizing Delavenne works for Reiden, Mitch escapes with both the Mother Cell and his daughter's medication. However, on their way to deliver the medication, Mitch and Abraham come face-to-face with a terrifying army of birds.

Danny has wanted a Plymouth Roadrunner ever since a couple of car nuts pulled him over a few years ago, and bought his Sebring on the spot. He's finally found one and he's doing it up exactly as he wants to. Meanwhile, Horny Mike takes on a side project that is as scary as it is silly.

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After a body turns up in Boston with links to another murder in Los Angeles, Jane and Maura pack up their sunscreen and hop on a plane. With the girls out of town, Angela and Korsak plan a double date with Kiki and Ron.

The artists compete for immunity in a Foundation Challenge based on a classic Rorschach inkblot test. Later, they pair off and use a unique gateway as inspiration for two makeups.

A customer wants to trick out his 2004 Harley Davidson Road Glide, but both Shannon and Ryan aren't sure they can do everything he wants. A fellow collector drops by dangling a rare 1970 Lincoln Mark III in front of Danny who can't wait to take her for a spin. Meanwhile Horny Mike wants to prove to Danny he can spot a good flip but instead gets sidetracked by a 1930 Ford rat rod.

An injured Mark ends up moving in with Emma and Maggie. Maggie finds it hard to deal with with a career that might have been.

To secure military support, Barry takes advantage of a sandstorm to overrun the Caliphate's military base. As the political tide shifts, Leila re-examines her loyalties and makes a bold play in the palace. Molly uses all the resources at her disposal to try and save Barry's life.

Artists paint with fire in the Flash Challenge; mounting pressure causes major mishaps; a romance between artists tests loyalties.

In early 1960s, New York City, officer Terry Muldoon runs the Public Morals Division, a plainclothes unit of the NYPD whose job it is to police vice crimes such as gambling and prostitution. Muldoon juggles various situations, including warning his gangster uncle Mr. O not to challenge the head of the west side Irish Mob and schooling the new recruit Shea how the division actually works. Muldoon also struggles to raise his family in the increasingly violent Hell's Kitchen neighborhood.

With Seth Branson in custody, most believe he's the killer and everyone gets ready for a Halloween dance. To make sure, Audrey and Noah search Rachel's video files for a connection to her staged suicide. Meanwhile, Emma learns Piper has tracked down Brandon James's mother and asks to speak to her in hope of answers.

Two contestants will lead a team of three celebrities, which include Paul Scheer, Amy Smart, Constance Wu, Randall Cobb, Randall Park and Bobby Moynihan, in hopes of winning the $25,000 grand prize.

Daniel profiles a former child star who dresses like He-Man, proves that Oatmeal Creme Pies turn people into liars and sells his most prized possessions.

Bill O'Brien and his Texans take part in a training camp in Houston, as coaches put the players through their paces.

The buyers return to Koreatown for an auction near the heart of Los Angeles. In order to score a good locker, Brandi is forced to keep an eye out for more shenanigans from Jarrod. Ivy and Mary form an unexpected alliance, while Rene goes locker crazy and buys units that may not pay out.

Chair's true intentions end up being revealed, which sees the Peepers on a mission to save the Bellacourts from destruction.

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For the nine bakers left, it's time to tackle the sweet ending to every meal - desserts.

The show talks to different people living with OCD and also looks at the therapy available and asks what neuroscience can offer by way of a cure.