Intergalactic Dino

Go back to a time when dinosaurs roamed the Earth. Big ones, small ones, and even medium ones, but those times are over. No human has ever seen a live dinosaur, well, to the best of our knowledge, anyway. Back then, the dinosaurs didn't have great technology.They didn't have technology! So, when other dinosaurs from a different planet went to see how their friends on Earth were getting on, they were not happy to see that Earth was polluted with these weird creatures, those creatures being humans! They must think that humans are responsible for the extinction of the dinosaurs, but, as we all think we know, they weren't.
There are many different theories on why dinosaurs became extinct, but, for some reason, the dinosaurs are gone, or so we think. But there's a problem: The dinosaurs from the other planet (whose technology is superior to that of the humans), are planning on avenging their friends by wiping out the humans. Their doom is surely near. Is human supremacy about to end?