The Cretaceous–Paleogene Extinction Event, also known as the Cretaceous–Tertiary Extinction, was a sudden mass extinction of some three-quarters of the plant and animal species on Earth, approximately 66 million years ago. It was caused by an asteroid that was drawn from space by the planet itself, as a mean to crack open the Superflow, in order to initiate its first White Event on Earth. The Starbrand housed in the asteroid created a new Starbrand from a dinosaur.
As a result of this event, the larger dinosaur species were wiped out. The small mammals having escaped the chaos could evolve and take new forms. This allowed the human race the opportunity to evolve. Many dinosaurs were taken by the Nuwali to a sanctuary on the southern continent know as the Savage Land.
- Before Avengers (Vol. 8) #26 attributed the extinction event to the first White Event, different explanations had been previously presented:
- In Iron Man Annual #10, the extinction of the dinosaurs is presented as the aftermath of a battle between the evil god Set and the Demogorge.
- In West Coast Avengers (Vol. 2) #44-49, it is revealed That Which Endures, a collective entity responsible for natural selection, decided dinosaurs were a evolutionary dead end and chose to focus on mammals.
- In Unbeatable Squirrel Girl #8, Loki makes an off-handed remark that the last time Ratatoskr was loose, "all the raptors got replaced by hairless apes who invented fax machines."
- In Captain Marvel (Vol. 5) #5, a "primal scream" caused by a cosmic being who was humorlessly described as getting "his knickers in a twist" was described as the caused of the extinction.
- Conflicting accounts have also been offered for the origin of the meteor that clashed with the Earth. In Thor (Vol. 2) #80, the many meteors that collided with the planet were caused by the forging of Mjolnir. In, Astonishing Spider-Man & Wolverine #1, the meteor formed from fragments of an ancient destroyed world. The fragments later became known as the Time Diamonds.
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