From veteran FRONTLINE filmmaker and chronicler of U.S. politics Michael Kirk and his team, this documentary traces the U.S. response to the September 11, 2001 terrorist attacks and the devastating consequences that unfolded across four presidencies. Drawing on both new interviews and those from the dozens of documentaries Kirk and his award-winning team made in the years after 9/11, this two-hour special offers an epic re-examination of the decisions that changed the world and transformed America. From the wars in Afghanistan and Iraq to the January 6 insurrection, America After 9/11 exposes the legacy of September 11 — and the ongoing challenge it poses for the president and the country.

FRONTLINE and ProPublica go inside Europe’s fight against terrorism — the missed warnings and the lingering vulnerabilities.

In a 2012 joint investigation by FRONTLINE and the Center for Public Integrity, correspondent Miles O’Brien uncovers the shocking consequences of a broken dental care system. Poor children, entitled by law to dental care, often cannot find a dentist willing to see them. Others kids receive excessive care billed to Medicaid, or major surgery for preventable tooth infections. For adults with dental disease, the situation can be just as dire and bankrupting. While millions of Americans use emergency rooms for dental care, corporate dental chains are filling the gaps in care, and in some cases have allegedly overcharged patients or loaded them with high priced credit card debt.

The inside story of the bitter clash between President Obama and Israeli Prime Minister Netanyahu. Amid violence in the Middle East, the film traces Netanyahu's rise to power and his high-stakes fight with the president over Iran's nuclear program.

FRONTLINE investigates Pakistani-American terrorist David Coleman Headley (Dawood Sayed Gilani) who helped plan the deadly 2008 siege on Mumbai. In collaboration with ProPublica, the film — an updated and expanded version of A Perfect Terrorist — reveals how secret electronic surveillance missed catching the Mumbai plotters, and how Headley planned another Charlie Hebdo-like assault against a Danish newspaper.

The dramatic story of a Gitmo detainee released from the controversial U.S. prison after 14 years. With NPR, a report on the struggle over freeing prisoners once deemed international terrorists. Also, the untold history of the Guantanamo Bay prison.

Examine the life of Adam Lanza, the Newtown shooter, and the battle over gun laws and gun culture. Adam Lanza shot and killed 20 first-graders and six adults at Sandy Hook Elementary School in Newtown, Connecticut, on December 14, 2012, before shooting himself.

An investigation into the hidden dangers of vitamins and supplements, a multibillion-dollar industry with limited FDA oversight. The film examines the marketing and regulating of supplements, and cases of contamination and serious health problems.

FRONTLINE investigates the widespread use of antibiotics in food animals and whether it is fueling the growing crisis of antibiotic resistance in people. Also this hour: An exclusive interview with the family of a young man who died in a nightmare bacteria outbreak that swept through a hospital at the National Institutes of Health.