1917. People have had enough of the war. Behind the scenes, uprisings are brewing, like the one that toppled the Tsar in Russia; on the front soldiers begin to mutiny as they did at Chemin des Dames in France. German submarine attacks in the Atlantic will finally pull the Americans into the war, but they arrive too late to help prevent the carnage of the Battle of Passchendaele.

Carter's dreams of change give way to Ronald Reagan. Gorbachev redeems Reagan and fresh opportunities for peace arise. The debate over Reagan's legacy.

The fourth episode plunges us into the heart of the jungle for an exciting story of power, politics, and survival. Days after a fierce battle with Western rivals, Jackson, the alpha male, grapples with the aftermath of his injuries. The strength of an alpha is paramount, and physical frailty can quickly translate into political vulnerability. While Jackson's allies waver, Abrams and Wilson see a golden opportunity to seize control.
As Abrams makes strategic moves against Jackson, the forest resonates with news of the ongoing power struggle, attracting the attention of external threats. Battles for leadership are perilous, with uncertain outcomes for both the reigning alpha and the ambitious challenger. This episode promises an intriguing exploration of chimpanzee society and their relentless pursuit of dominance.

It is fairly extraordinary that this film exists. The level of access attained by Tim Hetherington and Sebastian Junger over their 15-month period embedded with the Second Platoon, Battle Company, 173rd Airborne Brigade allows for an incredibly unvarnished account -- including footage of deaths both civilian and military. It's perhaps the most intimate and unflinching examination yet of the processes of modern warfare -- and an exhilarating, heartrending, profoundly moving film in its own right.

A deep historical look at one of the most controversial issues of our time, highlighting the abortion debate from various points along the ideological spectrum in a winding story of abortion in America. 47 years after it revolutionized abortion law in America, the landmark 1973 US Supreme Court case Roe v. Wade is once again at a crossroads. Reversing Roe depicts the state of abortion and women’s rights in America.

David Attenborough continues his search for the origins of flying animals, as he charts the rise of new, larger creatures – extinct reptiles that flew on wings of skin, dinosaurs that sprouted feathers to become the ancestors of birds, and gliding mammals that emerged from a life in the trees to dominate the night as bats. His journey spans the globe – from the rainforests of Borneo to see bizarre gliding animals, to China and its new discoveries of dinosaur fossils. Stunning CGI brings to life creatures that disappeared over 200 million years ago, and new filming techniques bring us closer than ever to the secrets of flight itself.