Six groups dominate the animal kingdom: fish, birds, mammals, reptiles, insects, and invertebrates. These evolutionary branches have produced Earth's largest, smallest, and deadliest creatures. From ocean depths to forest canopies, these Wild Assassins have evolved extraordinary weapons, strategies, and instincts to rule their domains. In six one-hour episodes, WILD ASSASSINS: KINGDOMS delves into the world of apex predators, ambushers, and survivors. Each episode reveals how evolution shaped their lethal adaptations—from the lightning-fast strike of a mantis shrimp to the stealth ambush of a crocodile. We'll explore their dominance as keystone species, maintaining balance in their ecosystems. But even these masters face mounting threats. As the natural world changes, their survival hangs in the balance, highlighting the fragility of even the fiercest creatures on Earth.