Plot Synopsis

In TRAFFICKED: UNDERWORLDS, Mariana van Zeller explores the inner workings of the most dangerous black markets on the planet. In each one-hour episode, she investigates a different underworld -- from the trade in body parts and hired assassins to sextortion and the smuggling of brides -- to meet the players, learn the business, and better understand the world's multitrillion-dollar shadow economy. Episodes include:

"Assassins" (Wednesday, January 17, 2024 at 9pm ET/PT on Nat Geo): Hitmen murder nearly 3,000 people a year around the globe, yet little is known about them. What drives a person to make a living out of killing? In this episode, Mariana journeys inside this violent trade, first tracking down an assassin in her hometown of Los Angeles before heading to a country where contract killings have become an almost daily occurrence: South Africa.

"Sextortion" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, January 24, 2024 at 9pm ET/PT on Nat Geo): Mariana investigates a new blackmail scam called "sextortion," in which compromising photos are used to extort victims. Heading to the Philippines to try and find the scammer who shamed one young American victim into taking his own life, she finds a scamming culture that is bigger, scarier and more complicated than she could have imagined.

"Body Parts" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, January 31, 2024 at 9pm ET/PT on Nat Geo): Every year, the sale of human remains generates billions of dollars worldwide. Astonishingly, this thriving trade remains largely hidden from the public eye. With little oversight, abuses abound. During her investigation, Mariana learns how anyone -- whether they've chosen to donate their body to science, cremation, or a traditional burial -- can become the victim of human remains trafficking.

"Black Market Meds" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, February 7, 2024 at 9pm ET/PT on Nat Geo): Americans spend more per capita on prescription drugs than anywhere else in the world. That's why nearly 20 million U.S. citizens are turning to the black market for their meds -- and why criminals are eager to cash in on the rising demand. In this episode, Mariana heads to Mexico and India to meet some of the underworld opportunists risking the lives of vulnerable patients.

"Apes" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, February 14, 2024 at 9pm ET/PT on Nat Geo): Mariana heads to the Congo to investigate the illegal trade of wild apes, pushing them to the brink of extinction. She'll follow the supply chain from the poachers to the brokers and ultimately to the buyers, many in the Middle East, who use these apes as pets and in sideshow attractions. She'll also spend time with Congolese activists who are fighting to protect apes from extinction.

"Migrant Smugglers" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, February 21, 2024 at 9pm ET/PT on Nat Geo): As the debate over America's broken immigration system continues to boil, Mariana heads to Mexico to investigate the billion-dollar business of people smuggling to the U.S. While following a 2,000-mile trail from Tapachula to the U.S. border, she'll try to understand who's making the money, how the cartels are involved, and why so little is being done to stop it.

"Hash Smugglers" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, February 28, 2024 at 9pm ET/PT on Nat Geo): The first drug that Mariana was exposed to growing up in Portugal continues to be Europe's favorite: hash. The booming popularity of this seemingly "soft drug" holds a dark secret. Mariana follows the trail of smugglers from the mountains of Morocco to their buyers in Europe -- a world of shadowy dealers, lightning-fast smuggling boats and increasing violence.

"Illegal Gambling" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, March 6, 2024 at 9pm ET/PT on Nat Geo): Americans love to gamble. The legal market made $53 billion in 2021. And yet that total is dwarfed by an illegal gambling underworld that rakes in an estimated one trillion dollars annually. Mariana goes inside this dangerous scene to try and understand its allure, its growth, and its dark side.

"The Drug Mule Scam" (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, March 13, 2024 at 9pm ET/PT on Nat Geo): When Mariana learns that 66-year-old American Rodney Baldus is locked up in a prison in Mozambique for drug running, she begins an investigation unlike any she's done before. She learns that international criminal syndicates are targeting elderly Americans with inheritance scams and conning them into becoming drug mules. But is it enough to prove Rodney's innocence?

"Terrorist Gold" [aka Caught in an African Coup"] (World Premiere on Thursday, January 18, 2024 on Hulu; Linear TV Debut on Wednesday, March 20, 2024 at 9pm ET/PT on Nat Geo): What starts as an investigation into rumors that gold mining is funding terrorist groups in Niger, gets turned on its head after a military coup puts the country on lockdown. While Mariana struggles to escape, she realizes that the gold trade is part of a much larger fight for influence in Africa that pits the U.S., Russia and China against some of the world's most dangerous terror groups.