Season 4

2026 · 37 episodes

Season 4 of fern. currently airing in 2026.

1How Cocaine Is Destroying Europe
2Why Otto Warmbier Didn't Survive North KoreaThis is the real story of Otto Warmbier and why the version most people remember may not be true.
3The $1 Billion Coca-Cola MachineThis soda fountain isn’t just serving you a drink. It’s quietly collecting your data — and Coke will profit from it tremendously.
4Did McKinsey Ruin Disneyland?How did the "Happiest Place on Earth" become a dangerous nightmare?
5How the Secret Service Actually WorksWho are the people protecting the President? How do they prepare for the unthinkable, and what happens when everything is on the line?
6The Assassination That Humiliated HitlerThis is the story of how Reinhard Heydrich, the most dangerous Nazi, Hitler’s “man with the iron heart”, was assassinated.
7The Most Mysterious Drug in the WorldThis is dimethyltryptamine, known as DMT – arguably the world's strongest psychedelic drug.
8How Iran’s Leader Was KilledThis is how the Israeli and U.S. attacks on Iran unfolded - how the country’s leader was killed, and what has happened since then. By the time this video is published, new details may have emerged.
9The Strange Attack on Flight 103This is the story of the Lockerbie bombing, one of the deadliest and most mysterious plane crashes in history.
10Why everyone hates Lego nowLEGO went from being a family favourite to a multi-billion dollar empire – why do so many people suddenly hate it?
11The Bank Heist of the CenturyA helicopter, a bomb and millions in cash. This is the story of the Västberga heist - one of the most spectacular robberies of all time.
12The Most Dangerous Job in CrimeThis is the insane, brutal world of Europe's coke runners.
13How Cops Robbed the Dark Web KingA hunt for Dread Pirate Roberts, thousands of stolen Bitcoin and a scapegoat that almost took the fall. This is the story of the cops who robbed Silkroad.
14Who Will Rule North Korea Next?This is the story of Kim Ju Ae, the girl who may rule North Korea one day.
15The Tragic Story of the Air India SurvivorWhat really helps you survive the extremely unlikely event of a plane crash.
16Facebook's Most Dangerous ProductThis is the story of Onavo.
17The World's Deadliest CompanyThis is the story of the world’s deadliest company: CNTC-STMA. A look into a core part of Chinese state economics and at the devastating effects of a state-sponsored public health crisis.
18The CIA's Most Valuable SpyThis is Operation Rubicon. One of the biggest intelligence coups of the 20th century.
19The Hunt for America's Weirdest KillerThis is the story of the infamous Zodiac killer. A mysterious serial murderer who made himself larger than life – and was never caught.
20The Insane Story of Serbia‘s Human SlaughterhouseThis is the story of one of Europe’s most notorious crime networks and their human slaughterhouse; their alleged ties to Serbia's elites; and an ingenious takedown by relentless investigators.
21We Investigated a New Designer DrugThese are Nitazenes, a highly potent but largely unknown class of synthetic opioids that are quietly entering the European drug supply.
22The Man Who Went Undercover in AuschwitzThis is the story of Witold Pilecki, the man who infiltrated Auschwitz.
23How Israel Kills JournalistsThe war in the Gaza Strip is considered the deadliest for journalists in the 21st century. Many are killed in strikes on residential buildings, civilian infrastructure, or directly while on assignment. However, there are also allegations that the Israeli military has deliberately targeted some of them. The IDF denies this. This is the story of journalism in Gaza - and the conditions under which it takes place.
24Why Putin Is So Hard to KillVladimir Putin has a lot of enemies. So how does he protect himself? In this video, we’ll look at four of the Kremlin’s security measures. They tell a story, one about the Russian state and its increasingly paranoid leader.
25The Kid Who Hacked AmericaThis is the story of Kevin Mitnick. Vilified by the media. Hunted by the authorities. Feared as one of the world's most dangerous hackers.
26How a $10,000,000 Poker Game Was (Allegedly) RiggedThis is the story of an enormous alleged poker scandal.
27Why Is There (Almost) No McDonald‘s in Africa?McDonald’s conquered the world - but not Africa. Why are the golden M’s so rare across the continent?
28The Truth About fernThis is how fern became fern, how we make our videos and what's next.
29Hansa: The Infiltration of the Dark WebThis is the story of one of the boldest international police investigations of all time, likely the largest trap in Darknet history. This is Operation Bayonet.
30Exposing a $1,900,000,000 Pharma CompanyThis is the story of a German pharmaceutical company, a billion-dollar opioid business, and a crisis spanning multiple continents. Is a new opioid crisis looming — one made in Germany?
31How China's Biggest Scammer Got CaughtThis is the rise and fall of crypto queen Zhimin Qian. After taking money from more than 120,000 people, she flees China and lives in luxury across Europe - until one small mistake brings everything crashing down.
32The Unsolved Murder in Room 1046This is the story of Room1046, one of America’s strangest unsolved murders.
33The $1 Billion McDonald‘s BoxThis is the story of McDonald’s iconic Styrofoam burger box and how it became one of the most controversial pieces of fast-food packaging ever made.
34The Death of Educational Content on YouTubeCountless AI slop channels are relentlessly copying our work. So one day we decided: enough is enough. We went undercover to investigate who’s behind them and what this flood of AI slop means for the future of educational content on YouTube.
35The FBI Agent Who Infiltrated the MafiaThis is the story about Donnie Brasco, the undercover agent who infiltrated the New York Mafia.
36How the World’s Most Dangerous Drug Lord Was CaughtEl Mencho may be the most powerful and ruthless drug lord in the world. His cartel has taken on the Mexican state and built a global criminal empire. How did he become so powerful? Why has no one been able to stop him? And what happens if he is finally caught?
37The Most Disgusting Influencer Campaign of 2026This is the story of how journalists uncovered a secretive social media campaign designed to lure young Americans to the Polymarket prediction market platform.

Episodes