For generations, grizzlies reign unchallenged as the top predators of Yellowstone. But everything changes when an old rival returns to the landscape. After almost a century’s absence, wolves are reintroduced to Yellowstone and again play a vital role in the ecosystem that depends upon them. Once the sole rulers of this vast kingdom, grizzly bears are now re-learning how to cope with the rise of an equal competitor. Track Yellowstone’s two apex predators as they once again meet head-to-head, vying to emerge on top.