Season 4
43 episodes · premiered Jan 4, 2026
Season 4 of fern. currently airing in 2026.
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E1 How Cocaine Is Destroying Europe
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E2 Why Otto Warmbier Didn't Survive North Korea
This is the real story of Otto Warmbier and why the version most people remember may not be true.
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E3 The $1 Billion Coca-Cola Machine
This soda fountain isn’t just serving you a drink. It’s quietly collecting your data — and Coke will profit from it tremendously.
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E4 Did McKinsey Ruin Disneyland?
How did the "Happiest Place on Earth" become a dangerous nightmare?
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E5 How the Secret Service Actually Works
Who are the people protecting the President? How do they prepare for the unthinkable, and what happens when everything is on the line?
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E6 The Assassination That Humiliated Hitler
This is the story of how Reinhard Heydrich, the most dangerous Nazi, Hitler’s “man with the iron heart”, was assassinated.
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E7 The Most Mysterious Drug in the World
This is dimethyltryptamine, known as DMT – arguably the world's strongest psychedelic drug.
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E8 How Iran’s Leader Was Killed
This 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.
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E9 The Strange Attack on Flight 103
This is the story of the Lockerbie bombing, one of the deadliest and most mysterious plane crashes in history.
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E10 Why everyone hates Lego now
LEGO went from being a family favourite to a multi-billion dollar empire – why do so many people suddenly hate it?
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E11 The Bank Heist of the Century
A helicopter, a bomb and millions in cash. This is the story of the Västberga heist - one of the most spectacular robberies of all time.
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E12 The Most Dangerous Job in Crime
This is the insane, brutal world of Europe's coke runners.
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E13 How Cops Robbed the Dark Web King
A 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.
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E14 Who Will Rule North Korea Next?
This is the story of Kim Ju Ae, the girl who may rule North Korea one day.
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E15 The Tragic Story of the Air India Survivor
What really helps you survive the extremely unlikely event of a plane crash.
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E16 Facebook's Most Dangerous Product
This is the story of Onavo.
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E17 The World's Deadliest Company
This 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.
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E18 The CIA's Most Valuable Spy
This is Operation Rubicon. One of the biggest intelligence coups of the 20th century.
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E19 The Hunt for America's Weirdest Killer
This is the story of the infamous Zodiac killer. A mysterious serial murderer who made himself larger than life – and was never caught.
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E20 The Insane Story of Serbia‘s Human Slaughterhouse
This 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.
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E21 We Investigated a New Designer Drug
These are Nitazenes, a highly potent but largely unknown class of synthetic opioids that are quietly entering the European drug supply.
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E22 The Man Who Went Undercover in Auschwitz
This is the story of Witold Pilecki, the man who infiltrated Auschwitz.
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E23 How Israel Kills Journalists
The 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.
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E24 Why Putin Is So Hard to Kill
Vladimir 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.
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E25 The Kid Who Hacked America
This is the story of Kevin Mitnick. Vilified by the media. Hunted by the authorities. Feared as one of the world's most dangerous hackers.
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E26 How a $10,000,000 Poker Game Was (Allegedly) Rigged
This is the story of an enormous alleged poker scandal.
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E27 Why 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?
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E28 The Truth About fern
This is how fern became fern, how we make our videos and what's next.
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E29 Hansa: The Infiltration of the Dark Web
This 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.
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E30 Exposing a $1,900,000,000 Pharma Company
This 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?
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E31 How China's Biggest Scammer Got Caught
This 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.
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E32 The Unsolved Murder in Room 1046
This is the story of Room1046, one of America’s strangest unsolved murders.
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E33 The $1 Billion McDonald‘s Box
This 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.
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E34 The Death of Educational Content on YouTube
Countless 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.
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E35 The FBI Agent Who Infiltrated the Mafia
This is the story about Donnie Brasco, the undercover agent who infiltrated the New York Mafia.
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E36 How the World’s Most Dangerous Drug Lord Was Caught
El 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?
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E37 The Most Disgusting Influencer Campaign of 2026
This is the story of how journalists uncovered a secretive social media campaign designed to lure young Americans to the Polymarket prediction market platform.
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E38 China's Secret Plan for London
This is the story of a controversial construction project in the heart of London. Behind it are growing fears over espionage, repression and the safety of thousands of people.
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E39 the entire history of 4chan, i guess
This is a story about the rise and fall of 4chan, an anonymous image board created by a teenager, and how it became a breeding ground for online culture, memes, and extremism.
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E40 The Most Feared Kids on the Internet
What does it take to hack the CIA, breach the Pentagon, or hijack Elon Musk’s Twitter (X) account and make millions? Apparently, sometimes just a teenager with a computer. These are five of the most unbelievable hacking stories we've covered.
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E41 The Stoner Kids Dealing Guns to the Army
Two stoners from Miami, a $300 million Pentagon contract, and an arms deal that spirals completely out of control. This is the incredible true story of David Packouz and Efraim Diveroli and their rise to become two of America’s most notorious arms dealers.
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E42 How Would a War With Russia Unfold?
What would happen if Russia attacked NATO? Drawing on military wargames, NATO assessments and expert analyses, we play out a hypothetical scenario based on a very real threat: a Russian invasion of the Baltics. How would NATO respond, and why would so much depend on Germany?
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E43 How the Internet Uncovered a Massive Pokémon Fraud
Pokémon cards are big business these days. Some are SO rare they seem too good to be true. Are they? This is the internet’s biggest Pokémon detective story.