They walked the Earth millions of years ago, as gigantic beasts the like of which we can only imagine today. Not all of the dinosaurs were carnivorous predators, but these colossal creatures were definitely very dangerous! So, which dinosaur was the biggest, baddest and most feared? Was the T-Rex really 'King of the Lizards'? Was Spinosaurus the true top dog? Or was there another dinosaur to defeat everything else?

It's one of the most defining moments in the history of Planet Earth. Crashing into the Yucatán Peninsula, 66 million years ago, the asteroid that wiped out the dinosaurs caused unprecedented damage, destruction and devastation. But what if that massive rock had missed? Would dinosaurs still exist? would the rise of the mammals ever have happened? And would we be here today? Expect an alternate reality of prehistoric proportions, as we investigate how the world would be different. For more such images and videos visit www.gettyimages.com