Twelve cooks remain for a mystery-box challenge using ingredients that get better with age. Later, the contestants work with the most dangerous protein in the show's history.

Leonard Snart AKA Captain Cold returns to Central City with a new hotheaded partner in tow - Mick Rory AKA Heat Wave. The duo plan to steal a multi-million dollar painting, but Cold has another agenda while in town - to set a trap for The Flash. Snart and Mick kidnap someone close to The Flash and threaten to kill them unless The Flash shows up for a battle of fire and ice. Barry tells Joe he isn't sure he should take on Snart again after the casualties that happened the last time they fought. Meanwhile, Barry asks Dr. Wells, Caitlin and Cisco to help him double his training efforts so he's ready for the Reverse Flash when he returns to Central City. Iris deals with the aftermath of Barry's confession, and Cisco makes the CCPD a new shield.

Leslie's team tries to strengthen her case that the Newport land should be turned into a National Park. Ron's team, fighting back, brings on a celebrity as a minority owner.

Secrets are hard to keep, especially when you are keeping them from a loved one. Spencer searches for Mona's missing laptop with Caleb's help but where the search leads them could cross the "Toby approved" line. Aria tries to get up the courage to come clean to Ezra about her lie when she gets diverted by a possible goose chase. And Hanna is stuck in the middle having to cover Ashley's secret when Pastor Ted returns with big news.

Leslie and Ron attempt to work out their differences.

Johnny tries to get a potentially offensive town sign taken down, while David is faced with the frightening task of finding a job.

After pulling Veronica off Maggie, David fails to convince his wife of his innocence.

After the massacre at the ranch, Dean, Sam and Castiel double their efforts to find a cure for the Mark of Cain but there is nothing in the lore that can help them. Desperate, Castiel comes up with an idea that Sam deems the "single worst idea I've ever heard". Meanwhile, Rowena continues to plot against Crowley, and Castiel tries to mend his relationship with Claire who is plotting revenge against Dean for killing her friend.

Bay gets an interview for a long-awaited submission with the Kansas City Artist Showcase to have her art be part of a public display but realizes her current status may prevent her from qualifying. When a dorm resident continues to prank the deaf students, Daphne challenges him to a dorm triathlon. Regina finds herself drawn to an East Riverside coffee house and its owner. A birthday milestone gets John thinking about the next chapter in his life. Meanwhile, Emmett makes a new friend at film school who gets him a gig on a real production.

Oscar winner Rick Baker is the guest judge for the first Spotlight Challenge, which finds the artists working in teams to create two original alien characters, plus a primate leader.

Josh and Bill go into the water business to secretly sell their shine. Tim returns to Virginia to fill a huge last-minute order. Mark takes a second shot at delivering his liquor by boat. And Tickle's deal with a moonshine savior almost breaks down.

Gerry is finally given an opportunity to coach the varsity boys' basketball team but finds himself in an awkward position with a player's dad.

The buyers head to Santa Ana, CA where dreams of great lockers spice up the auction. Jarrod and Brandi get a locker that leads to the sweet life while Mary tries to get something more collectable. And Darrell comes across a find that may be another huge win for the Gambler.

When Brody discovers Jenny never wants to get married it's a blow. When she says she doesn't like musicals, it's just salt in the wound. But if Brody can change Jenny's mind about musicals, maybe one day she can change her mind about marriage. Mansfield gets out of planning his daughter's wedding by pawning his wife off on Threepeat (in full wedding planner mode), only to feel he's missing out. Derrick convinces Harvard he's taking things too fast with Lindsay - too bad it wasn't before Harvard visited the tattoo parlor.

Abby prepares to pitch her new brand to her agency when Jo, an old friend from college arrives with her blunt, brassy New York attitude. Things get complicated when Jake gets a job directing an episode of Becca's TV show "Blood Sisters".

When Grayson helps Andy with his tryouts for a new best friend, Jules and Ellie step in to run the bar. But they soon find it's harder than they thought. And Travis and Laurie spend their first weekend alone with Baby Bobby.

Raylan guides Ava through the process of informing on Boyd and tries to turn Boyd's old ally Dewey Crowe against him as well, all while Boyd works to pull off a daring heist right under Raylan's nose.

Tony is shocked when two of his Skeletons move in, creating a battle for his affection between them and Madison.

The Too Much Tuna guys prank a doctor and decide to leave New York City, "Show Us Your Songs" returns, and Dr. Armond meets some potential new female companions and has a realization about his wife's killer.

Jennifer Lopez

Conan O'Brien was joined by Sleater-Kinney.

Larry takes an unflinching look at the sexual assault allegations against Bill Cosby with panelists Jamilah Lemieux, Kathleen Madigan, Baratunde Thurston and Keith Robinson.

Tonight guests are actor Jude Law and film actress Keri Russell. Musical guest will be rock band Fall Out Boy.

Nick Thune, Ben Kronberg and Ali Wong compete to determine who has the funniest take on the day's pop culture.

Puss misses the old days adventuring with his buddy Jack Sprat. Fearful he will leave San Lorenzo, Dulcinea concocts a super special adventure surprise with the orphans. But Jack Sprat shows up with the promise of a damsel in distress... who turns out to be a super scary monster.

Seth was joined by Lauren Graham, Rainn Wilson and Brian Michael Bendis.

Host: Jim Gaffigan; Guests: Sarah Silverman, Kumail Nanjiani

When a dead man is found inside a locked bank vault, Father Brown must solve the mystery to save an innocent man from paying the ultimate price.

Cardinal Wolsey loses his job as lord chancellor and has no choice but to flee his palace at York Place. His hopes of returning to the king's favour are with the loyal Thomas Cromwell.

The team are called into investigate after a teenage girl is discovered naked on some waste ground suffering with some life-threatening injuries.