At the beginning of this week's episode, a huge twist is revealed by Dwayne Johnson. Then in this week's Team Challenge, contestants take death-defying leaps off a building and climb 40 stories up an abandoned elevator shaft. Someone must attempt a daunting open-water swim through the ocean in the Hero Challenge. No one is safe. In the War Room, Dwayne asks the heroes to find their warrior spirit for the toughest challenge yet. And Charles makes a stirring plea.

The challenges don't stop now that the chefs have received their black jackets, as Chef Ramsay surprises them by bringing back a team of previous HELL'S KITCHEN winners to challenge them at dinner service. Ramsay lets the teams design their own menus for dinner service and the finalists will go head-to-head with the returning champs. Tune in to see if this season's competitors can take the heat

Michael tries to learn about Burke's underground network; Fiona and Madeline must frame a corrupt Russian bureaucrat for treason.

Stand tall with the Pawn Stars when a letter signed by Napoleon Bonaparte marches into the shop. Marked with Napoleon's official seal, is this a piece de resistance, or another Waterloo? Then, a guy flashes a collection of Las Vegas police badges from the 1940s. Will Rick and Chum bring them in for questioning? And later, a woman springs an antique pogo stick on Corey. Will he tell her to bounce?

Prepare to dive with the Pawn Stars as the guys check out a first edition copy of 20,000 Leagues Under The Sea. One of the rarest first editions, can they navigate this monster deal? Then, a collection of signed Metallica memorabilia rocks into the shop. Will the negotiation have Corey and Chumlee banging their heads? And later, when Rick starts taking guitar lessons, the guys try to talk him into a pawn shop jam session.

Charlie steals a hot woman from an angry nerd. Lacey takes drugs in order to sell drugs.

When Andy is forced to ride with Swarek's new girlfriend, Officer Marlo Cruz, they butt heads over different approaches to the job. But when they come face-to-face with an out-of-control EDP [Emotionally Disturbed Person], their differences are put to the test and one of them has to pull the trigger. Meanwhile, the rest of 15 Division is on the hunt for an armed burglar following a string of ATM robberies, and Dov is forced to work with rookie Chloe Price who he hooked up with at Frank and Noelle's engagement party. Together they track down the burglar, but Dov is wary of his new partner and her methods. Andy and Dov are both out to prove their history within 15 Division, but soon realize that there's value in having a fresh perspective while on the job.

Ryan distrusts his sister's new love interest.

Steve holds a Ladies' Night in an effort to boost his reputation on social media. A newly made-over Melanie is hit on by duplicitous ladies' man Neal (guest star Kunal Nayyar). And Hank unknowingly courts a Filipino ladyboy named Angel (guest star Nick Endres).

With just three days left in the season, a team sets off to find a serial killer gator named "The Reaper" that has been snatching cattle from ranches in the middle of the night-while another veteran team is plagued by catching alligators so big, they can barely remove them form the swamp. A legendary swamper rallies his family to leave their boats behind and hunt beyond deep in the woods of the bayou.

Despite Briggs' hesitations, Mike gets recruited by a Nigerian drug lord to teach gang members how to shoot well, while Paige recruits Jakes and Tuturro to go undercover with a flirtatious and dangerous female pot farmer.

Ryan takes Wilfred to a dog training class in the hopes of winning over a girl.

Tom Goldstein

Kevin Hart, Chris Kluwe, Eve

Daniel Libeskind

Johnny Depp, Adam Newman, Dawes

David Spade, Joey King, Grace Potter

Channing Tatum, Marc Maron

In this episode, Jimmy Carr and Griff Rhys Jones are on David's team while Lee is joined by Dave Myers and Susanna Reid.

Graham is joined by Oscar-winning actress Sandra Bullock who talks about new comedy The Heat. Also on the sofa are actor Samuel L Jackson and comedian and writer Nick Frost who stars with Simon Pegg in The World's End. Music comes from Jake Bugg.

Megatron becomes suspicious about the results of Project Predacon.