Meet the elite team that will attempt to endure Africa’s grueling wildebeest migration. The herd sets out on foot, unarmed and without a map or compass. Before long, the group is lost and tempers flair. With the wildebeest miles ahead, the humans realize they might be the only thing left on the menu. Within hours, they stumble into a lion pride’s territory and are surrounded by hungry hyenas.

The herd continues its trek across the Serengeti. They decide to risk camping for the night, but a sudden downpour threatens to extinguish their fire — the only defense against predators in the dark. Unarmed, alone and far from a hospital, two sudden tap-outs rock the herd’s “safety in numbers” strategy at the worst time. Then they face their greatest fear — a pride of lions in the pitch black.

The savage landscape is taking a toll and the herd struggles with extreme hunger. When one of their strongest members faints, they wonder: How will the weaker ones ever survive? Later, the herd is faced with a soaring cliff face. With limited equipment, they draw on their skills to attempt a dangerous route down. The next day presents the toughest challenge yet — crossing a croc-infested river.

Recovered from their first river crossing, the human herd are moving fast in an attempt to catch up with the wildebeest migration. An unexpected threat challenges their journey: poachers. The danger, exhausting terrain and hunger push tensions higher and the group begins to crack under the pressure. Later, two members are injured by a warthog and a new river presents the daunting threat of hippos.

The herd has been stuck on the banks of a flooded river for two days. Water levels fall and they attempt a crossing but must be wary of the nearby hippos and crocs. Low on food, the herd increases pace, but hunger is having a serious effect on a diabetic member and a doctor is called. Rising tensions cause the herd to split, but their best defense is their size, and sticking together is vital.

Only 32 miles — and a soaring waterfall — stand between the remaining herd and the finish line. Overcome by hunger, exhaustion and injuries, the group must fight to the end. A member with an infected leg is accused of slowing the group down, and dysentery and dehydration of another brings the herd to a standstill. Meanwhile, lethal predators continue to be an ever-present threat.