and we could have it where they were actually defeated by ancient humans back in the past and have a personal grudge against humanity in general.
as they were a natural evolution of dinosaurs, whereas humans are natural evolution of mammals, and the extinct believe that they should be the ones who inherited the earth.

Okay...Let's combine these two ideas. Ancient Humans defeat the Dinosaur beings. Their grudge semi-preserves/reanimates them. This grudge being a spiritual thing is what gives them the mystical/magical aspect and also allows them to assume a somewhat humanoid form.

To keep it scientifically accurate, dinosaurs didn't exist along with humans. Let's say they wake up after being hit by a meteor and find these puny little creatures acting like they own the earth (humans in pov of the Extinct) and want to take back their position as the strongest creatures on earth.

That's why I said "Dinosaur beings".

How about when the dinosaurs were hit by the meteor, the radioactivity from the meteor mutated them while also putting them in a slumber.

Okay. That explains the evolution. Then they wake up and fight against ancient humans, lose, grudge semi-preserves, and reanimates them. There's the mystical aspect.

I don't really want to include humans in this. It's not really accurate.

And aliens that enter a humans body, copies their personalities, kills them, and takes their place is? That's what the Worms in Kabuto do, correct?


I thought we had agreed that the villains were magical/mystical? Their grudge against the humans would be the most logical reason for such a thing. Besides, this is a work of science-fiction and fantasy. Accuracy goes right out the window, mostly, when these two genres are involved together.

Magical meteor maybe?

what about that dinosaurs were the original inhabitants of earth until ancient aliens (human) killed them all via meteor to take the word for themselves. then generations later feeling guilty about what they did they hid the events as evolution while not knowing that surviving descendants of the dinosaurs are plotting to get back their planet.

thought about this while watching ancient aliens :)