They are the big bosses in their neighbourhoods and they've earned big respect from the other residents but in every case and in every place things can change in a heartbeat. The natural world has a way of challenging even the most majestic creatures and the natural cycle of life and death catches up with every living thing, regardless of their size or their power. Who will rise to their challenges? Who will be lost to stronger or bigger forces? We're ultimately faced with a disturbing question: what would these complex, sometimes brutal and completely balanced parts of paradise be without their carnivores? The beautiful, lush Ngorongoro Crater in Tanzania is home to the highest density of large carnivores in Africa. Planet Carnivore: Lions takes you deep inside this isolated volcanic crater to meet the crater's oldest lioness as she struggles to reign over her kingdom, despite fierce competition from other ravenous carnivores. A pride's young lioness and their best hunter is missing. Days later, she is found dying from a virus. As proof of the timeless war between lions and hyenas, within hours, the savannah s other apex predators move in and soon there is nothing left of the big cat.