A look into how the body defends itself against all odds through the stories of a nature survivalist, rancher twins, a doctor who survived Ebola and a cancer therapy recipient. The Immune System, essential to our survival every second, is the most complex and least understood piece of our biology.

In changing seas and oceans, cephalopods like the cuttlefish and the giant Pacific octopus must rely on their remarkable intelligence to survive. Their alien appearance comes with astonishing resources, independence, and invention. And there's still so much to learn about these rarely seen legends of the deep.

Be it foxes on city streets or wolves on the tundra, canines rely on sharp senses, athleticism and fierce determination to punch above their weight. But the real secret of their success is much more surprising. It's a story of their intimate side. It's what makes every dog, from pet pooch to wild dogs, one of the family.

After losing his drive to continue surfing at Nazaré, Garrett McNamara decides to return to competitive surfing at other big-wave sites. In order to compete in a tournament at California's Mavericks surf site, he must surf there regularly, something that he has done many times in the past. McNamara returns to Mavericks only to suffer a horrific injury on a wave he should have aced.

In the last episode we are taken on a gripping journey into the lives of a magnificent family of tigers in Bandhavgarh, India. This family, led by a tigress named Raj Bera, faces numerous challenges and triumphs. As we delve into their world, we witness the extraordinary bonds, fierce determination, and the will to survive against all odds. Raj Bera is the matriarch who must teach her cubs the essential skills they need to thrive in the wild. Her cubs are not only the heirs to her dynasty but also the future of the tiger species itself. In a land with increasing human encroachment and threats of poaching, the family's story is not only an intimate portrayal of their lives but also a glimpse into the larger conservation efforts to save these magnificent creatures from extinction.
Throughout the documentary, you'll see breathtaking scenes of tiger family dynamics, from nurturing to hunting, as they navigate their way through the challenging Indian landscape. The captivating narrative underscores the urgent need for protecting these remarkable animals and the critical importance of providing them with the space to preserve their ancient heritage. The film is a moving and eye-opening exploration of these majestic creatures and the dedicated conservationists working tirelessly to ensure their survival. It is a must-watch for anyone interested in the natural world and the future of one of the most iconic and endangered species on our planet.

To recruit actors for his rehearsals, Nathan opens an acting studio in Los Angeles, teaching 'the Fielder Method', which involves covertly observing and imitating unaware subjects. Feeling insecure about his own performance, Nathan reenacts the class with actors and a fake Nathan as the teacher while the real Nathan plays the role of Thomas, a student. Nathan makes his students immerse themselves in other people's lives while he immerses himself in Thomas's life, even living in Thomas's home.
Nathan returns to Oregon, where his 'son', Adam, is now a teenager. Nathan and Joshua, the actor playing Adam, decide that Adam should lash out due to resentment of his absentee father and develop a drug problem, a situation that mirrors Angela's own past. Adam suffers an overdose and is tended to by emergency responders played by Thomas and another Fielder Method graduate. After he runs away from home, the 15-year-old Adam reverts to a 6-year-old since Nathan plans to relive his son's earlier years.