Joy and Mark travel to Borneo to explore the reproduction challenges of our close cousin - the orangutan. The largest tree dwellers on the planet, orangutans mate, give birth and raise their young high in the jungle canopy. At an orangutan sanctuary in the rainforest, Mark and Joy come face-to-face with a super-male and uncover the latest scientific theories about how these kings exert their power over other males and seduce females in their territory. Joy witnesses the sneaky tactics that the females use to take control of mating and Mark finds out how males fight back. The lengthy period dedicated to raising one child is critical to the success of orangutans and all the other great apes - including us.