When nature calls, a fan's risky survival strategy backfires and endangers the challenge in the Arizona desert; an Eagle Scout and a stay-at-home mom struggle to survive among rattlesnakes and mountain lions while overcoming their own mistakes.

Mel goes undercover as a volunteer for a rising politician when McCall tries to help a despondent college student being threatened by someone inside the candidate's campaign. Also, McCall worries when Delilah starts hanging out with a young girl who served time in juvenile detention and reminds McCall of her own troubled youth

Contestants perform duets with surprise celebrity guests for a chance to make it to live shows.

Human rights abuses in Egypt; violence and impunity on US military bases.

When attendance at their local church begins to drop, the Harts plot to bring down the neighboring megachurch. Meanwhile, Violet tricks Wayne into helping her pull a prank that backfires.

After a Molotov cocktail is hurled into Pride's bar, evidence leads him directing to his old nemesis, Sasha Brousard, who has been keeping a secret that will affect his life forever. Also, Tammy uses her profiling skills on Hannah and Carter with shocking accuracy.

A health scare has everyone in Hope Valley worried about one of their own. Nathan is finally going to get Allie's adoption finalized. Lucas starts to become suspicious of Christopher's behavior.

An Australian bushman and an American biologist form an intimate bond as they take on the Namibian desert together. The relationship grows as they search for scarce food along a thin stretch of raging river whole territorial baboons track them at every turn.

As Decourcy increases pressure on the Justice Department, Jackie counters by looking into his adversary's romantic past. While Jackie's digging up dirt, Siobhan is planning ahead, focused on starting a family even as Decourcy remains preoccupied by the escalating conflict. Jenny realizes she can't keep ignoring her mother after an unsettling phone call. With business at the salon all but dead, Cathy Ryan turns to an unlikely income source.

With less than 48 hours, Alfred, Thomas & Martha concoct a plan to infiltrate Raven headquarters with Daveboy and Lucius to steal Project Stormcloud.

It's Zoey's 30th birthday, but before she can celebrate properly she must confront her unresolved feelings for the men in her life.

Callen and the team discover that Anna is being held by a group with ties to Anna's upbring and must rescue her before she is forcibly returned to Russia. Also, Admiral Kilbride makes Nell a serious offer.

Carol takes Negan on a journey, hoping to minimize the increasing tension. Negan reflects on the events that led him to this point and comes to a conclusion about his future.

Kev and V announce their big news. Lip has some promising leads on selling the house, forcing Debbie to reevaluate her future and her whole history of regrettable love interests. Ian and Mickey try to adjust to a vastly different life on the West Side. Carl's commitment to the force is challenged when he's reassigned to an unglamorous police unit. Liam reminds Frank of everything that makes Frank, Frank.

Join Chris Hardwick to talk about "Here's Negan" from season 10 of "The Walking Dead".

An Amber Alert sends the team on a race against time to find a newborn infant who was stolen from a local hospital. Meanwhile, Officers Jackson and Chen work their last shift as rookies as Officer Nolan continues on for 30 more days.

Main story: How national debt works and why it might be more helpful than you'd think; plus, Giuliani freaks over Lil Nas X; Amazon's anti-union tactics; Peeps and Pepsi form an unholy alliance.

Tension builds among the disciples as they wrestle with the increasing fame of Jesus in Samaria. Jesus rebukes Big James and John for their prejudice and, after a near-violent encounter, gives them a new nickname.