FRONTLINE’s Martin Smith was one of the only Western journalists to enter Yemen in 2017, to get a first-hand look at what the United Nations recently called the largest humanitarian crisis in the world.

Described by some military commanders as the deadliest urban combat since World War II, the battle to drive ISIS out of Mosul was brutal and grueling. FRONTLINE takes you inside the fight -- going on the ground with four young soldiers on a team of Iraqi Special Forces who helped lead the effort. "Mosul" premieres October 18 on PBS and online.

How did Russian president Vladimir Putin come to see the U.S. as an enemy, and why has he sought to sow distrust in America's democracy? From filmmaker Michael Kirk and the team behind "The Choice 2016" comes this epic, two-part documentary examining Putin's rise, rule and motivations, and the American responses. Airing Wednesdays, Oct. 25 & Nov. 1 on FRONTLINE.

How did Russian president Vladimir Putin come to see the U.S. as an enemy, and why did he decide to target the 2016 American election? From filmmaker Michael Kirk and the team behind "The Choice 2016" comes this epic, two-part documentary examining Putin's rise, rule and motivations. Airing Wednesdays, Oct. 25 & Nov. 1 on FRONTLINE.

Who killed Kim Jong-un’s half brother, Kim Jong-nam, and what does the murder reveal about the North Korean leader and his regime? Amid growing nuclear tensions, “North Korea’s Deadly Dictator” examines claims that the North Korean leader ordered the assassination of his half brother, and sheds light on his broader intentions and capabilities. Premieres Wed., Oct. 4 at 10/9c.

The little-known story of the only U.S. bank prosecuted in relation to the 2008 financial crisis. Director Steve James ("Hoop Dreams," "The Interrupters") chronicles the Chinese immigrant Sung family’s fight to clear their names.

On September 12, 2017, FRONTLINE presents the broadcast premiere of "Abacus: Small Enough to Jail" -- the little-known story of the only U.S. bank prosecuted in relation to the 2008 financial crisis. Director Steve James ("Hoop Dreams," "The Interrupters") chronicles the Chinese immigrant Sung family’s fight to clear their names.

The filmmakers behind "Abacus: Small Enough to Jail" discuss their investigation into the only the only bank to be prosecuted in relation to the 2008 financial crisis.

Yemen is home to what the United Nations recently called the “largest humanitarian crisis” in the world. Access inside the country for foreign journalists has been rare — but FRONTLINE’s Martin Smith made it in.

Meet Erroll Brantley on the day he’s released from prison on parole in this excerpt from “Life on Parole.” The documentary follows Brantley and three other former prisoners in Connecticut as they navigate the challenges of more than a year on parole — from finding work, to staying sober, to parenting — while under intense supervision from the state. In collaboration with The New York Times.

With unique access, go inside an effort to change the way parole works in Connecticut and reduce the number of people returning to prison. In connection with The New York Times, FRONTLINE follows four former prisoners as they navigate the challenges of their first year on parole. The film premieres Tuesday, July 18 on PBS.

FRONTLINE investigates the battle over climate change, what Russia’s president really wants, walls at our borders and more. Here’s a sneak peek at documentaries we’re working on for Season 36.

The filmmakers behind "American Patriot" discuss their investigation into the armed uprising against the federal government.

While making “American Patriot: Inside the Armed Uprising Against the Federal Government,” FRONTLINE obtained secret footage from when the FBI posed as a documentary film crew to infiltrate the Bundy family -- footage that has never before been released.

FRONTLINE investigates how the Bundy family’s fight against the government invigorated armed militias and “patriot” groups. "American Patriot: Inside the Armed Uprising Against the Federal Government" goes inside the family’s standoffs over land in the West, and examines how groups aligned with them have grown to levels not seen in decades.

FRONTLINE goes inside Trump advisor Stephen Bannon’s war—with radical Islam, Washington, and White House rivals. From Michael Kirk and the acclaimed team behind "The Choice 2016" and "Divided States of America" comes the story of Bannon’s fight to deliver on Trump’s promises, with a confrontational style based on his personal crusade to dramatically transform America.

With NPR, FRONTLINE investigates the billions spent on housing low-income people, and why so few get the help they need. The documentary examines the politics, profits and problems of an affordable housing system in crisis.

Inside the fight over the fate of juveniles in prison for murder, following a landmark Supreme Court ruling. The film examines the impact of the order to re-evaluate thousands of juvenile murder cases and follows two of the first convicts to be released.

Author and fisherman Paul Greenberg spent a year eating seafood for breakfast, lunch and dinner in an attempt to find out. Meet Paul as his quest begins in this excerpt from "The Fish on My Plate."

As part of his quest to investigate the health of the ocean — and his own — bestselling author and lifelong fisherman Paul Greenberg ("Four Fish"; "American Catch") spends a year eating seafood for breakfast, lunch and dinner. With people worldwide consuming more seafood than ever, Greenberg also explores questions of sustainability and overfishing in this 90-minute FRONTLINE special.