The Serengeti takes a toll on the herd. They battle hunger and must rappel a cliff face. The next day brings another obstacle: a croc-infested river. ...

The herd continues its trek and enters dangerous new terrain. Unarmed and far from a hospital, two tap-outs rock their safety in numbers strategy. ...

Meet the elite team that will brave harsh elements, deadly predators and each other as they attempt to endure Africa's grueling wildebeest migration. ...