Friends and enemies converge in Victorian London to await the arrival of The Witness. Cole and Railly lead their pursuers on a manhunt through time.

King Henry VII and Lizzie travel to Spain in an attempt to secure their son's betrothal, but news of their country's instability has preceded them. Meanwhile, unrest has been growing in Burgundy and spills over into an English battle.

When Homer's court case determines that a dog's life is more valuable than a human's is, the status of man's best friend rises in Springfield. When the dogs recognize their new position of power, they assert their dominance over the humans.

Dan's attempt to get Chris his job back goes awry when Dr. Cobell has a heart attack.

Kim and Kourtney force Khloe to take a sentimental sister trip to Palm Springs to relive some of their fondest childhood memories; to save his relationship, Rob meets with a life coach; Kris receives an outrageous proposition from a royal family.

Laurie Garvey, a former therapist, must become one again as she heads to Australia to help Nora and Kevin along their paths.

Elizabeth heads to Brussels to seek NATO'S support against Russia when it threatens to invade Bulgaria, but when France refuses to cooperate, it threatens the alliance's existence. Also, when Henry's new government role has him dive into the Russia issue, he turns to his former operative, Dmitri Petrov, for help, and as Nadine and Mike B's relationship heats up, Elizabeth finds out information about her old friend that makes her question his loyalty.

Cole and Railly finally learn the heart-breaking life story of the man who calls himself The Witness, the reason why he wants to destroy time and all reality is revealed.

Cassie helps Ben find an old romantic film to showcase at the refurbished Middleton Theater's opening night. Martha's promises to the town are in jeopardy when she overextends herself with the Middleton budget.

Dale Cooper remains trapped in the Black Lodge. In Twin Peaks, Dr. Jacoby receives a shipment of shovels. At the Great Northern, Ben Horne introduces his brother Jerry to his new secretary, Beverly. Deputy Chief Hawk gets a call from the Log Lady, who tells him some evidence relating to Dale Cooper is missing. In New York City, Sam Colby sits in a warehouse watching a glass box. Tracey Barberato visits him. With the security guard absent during Tracey's second visit, Sam lets her into the room. As they have sex, an entity materializes inside the glass box and murders them. In Buckhorn, South Dakota, Cooper's doppelgänger - a sinister, long-haired man with black irises - retrieves two associates, Ray and Darya. Police find the severed head of Buckhorn librarian Ruth Davenport placed on the headless body of a John Doe. Local principal Bill Hastings's fingerprints are found and he is arrested. Bill denies guilt, but fumbles his alibi.

Harlee helps Nava cover his tracks after a violent encounter, revealing a side of herself Nava's never seen before and putting their relationship in jeopardy. Wozniak faces a ghost from his past in order to take down a new enemy in his present. Stahl gets a critical piece of information in his hunt for the truth about Miguel.

A former military man and an optimistic naturalist face humidity, violent storms, caiman, and red-bellied piranha in the Amazon jungle.

When Chris' Mexican girlfriend, Isabella, gets deported, he volunteers to take care of her twin babies. After learning that Isabella can't come back to the U.S., the Griffins go to Mexico to return her children.

The story of Laura's life and death is explored, including her first encounter with Shadow and how exactly she came to be sitting on the edge of his motel room bed.

Bourdain discovers a hub of international cuisines and cultures in the New York City Borough of Queens. Traveling via the No. 7 train, the host dines on morcilla (blood sausage) with Sean Basinski of the Street Vendor Project in Corona, samples Chinese food in Flushing with Swet Shop Boys member Himanshu Suri, imbibes at historic Neirs Tavern (seen in GoodFellas) in Woodhaven, eats a Tibetan dinner at Llasa Fast Food in Jackson Heights, and takes a detour to Aqueduct racetrack in South Ozone Park with his Appetites cookbook co-author Laurie Woolever.

Peter's past as a sperm donor catches up to him when many of his children show up unannounced to his house.

Cracks in Richard's latest partnership become more apparent when he's forced to deal with an unexpected interloper. As things get more serious, Dinesh scrambles to find a way out of his new relationship. After learning of surprising developments afoot at Raviga, Monica has trouble deciding which horse to back.

Every imaginable threat descends upon Railly and Cole. With Titan looming - and ally fighting ally - The Witness finds himself on the threshold of destiny.

Bill Hastings's wife, Phyllis, accuses him of having an affair, while Phyllis has been having an affair with Bill's lawyer, George. A ghostly entity occupies another cell. Phyllis is murdered at home by Cooper's doppelgänger. Attempting to obtain information through Darya, Ray, and another associate, Jack, Cooper's doppelgänger perceives that his associates have turned on him. He murders Jack and Darya, learning that the three were hired to kill him. He reveals that he is due to return to the Black Lodge, but has a plan to avoid this. In the Black Lodge, Cooper encounters Laura and Leland Palmer, MIKE, and an evolved form of The Man from Another Place, now a skeletal tree with a featureless head. It tells him Cooper cannot leave before his doppelgänger has returned, but the tree's doppelgänger intervenes. The floor of the Black Lodge gives way and Cooper falls into the glass box in New York, then into space. In Twin Peaks, Hawk continues his investigation into the Log Lady's cryptic words, and James Hurley shares a nostalgic moment with Shelly Johnson at the Roadhouse.

Sunny faces the toughest showdown of his life; Bajie's loyalties are tested to their limits.

In a dramatic confrontation, Wozniak faces the ally who betrayed him and makes his most difficult choice yet. Meanwhile, Stahl's fanatical plan to take Harlee down for murder finally pays off, forcing Harlee to get dangerously close to the man who's obsessed with her. In the end, Harlee and Wozniak's desperate efforts to save themselves and the crew lead to shocking consequences for both.

Still mourning the loss of their chief provider, the remaining five survivalists endure yet another shocking development when they learn they are not alone in the jungles of the Amazon and are given an opportunity to join forces with others.

Holmes and Watson pursue an elusive criminal as a gang war erupts in New York City. While the NYPD works to contain the violence, the two investigate the murder that appears to have ignited the city-wide conflict, and discover that a familiar face is pulling the strings.

Selina takes a trip to Qatar; Jonah gets a dinner invitation; Dan has an unexpected visit from an HR rep; Catherine and Marjorie have big news to share.

Main segment: Stupid Watergate

Other segments: Donald Trump's disclosure of classified information to Russia, Comey memos, Transportation Security Administration.

Mike remembers the team's first mystery.

A surprise visitor delivers divorce papers to Kimmy. Jacqueline comes up with a plan to get Russ's dad to rename the Redskins.

Just as Dev's personal life reaches a tipping point, disturbing revelations throw his professional life into turmoil, too.

El Chapo spent four months isolated in The Paddies on orders from La Licenciada. After a long time in the punishment cell, El Chapo returns to his cell where he believes he can rest from so many humiliations.

The bottom three contestants from the invention test now face off in the pressure test elimination, and have to recreate an ice cream float with a helium-filled toffee ballon.

Malotru is hostage to Daech, and the DGSE tries to get him out of this hell with the help of Nadia and his Syrian contacts. The CIA is not enthusiastic about seeing the hostage come back and the potential scandal of its betrayal. Marina, traumatized by her detention in Iran, is devastated by paranoia ...

As negotiations begin between the DGSE and Daech, via Nadia, Malotru sees a glimmer of hope: one of his jailers is a mole of the Russian secret services and can help. Duflot tries to help Marina overcome her trauma.

The team celebrates their escape from the Vermillion Army, but Acronix and Krux are determined to get their Blade back.