Saviors turned savage, camouflaged ambush killers, and creatures too bizarre to be true. Each mind-bending moment is so unbelievable, you'll question whether it's fiction, or frightening fact. We're counting down the top ten moments of a World Gone Mad.

Explosive river invaders, trespassing reptile behemoths, and tyrants fighting to end all competition. These clashers and crashers battle to the death. When an animal strays from home, anything can happen. We're counting down the top ten Deadly Duels.

Awesome adaptations; incredible interspecies rescues; and an urban legend that becomes reality are explored.