Getter Robo is full of things that defy the laws of physics, but it’s not really the physics that we’ll be looking into today. It’s the implications the title robot’s power source has for biology that concerns us.
Getter Rays are called the energy of evolution. (As is Spiral Power from Gurren Lagann, in direct homage to Getter.) They are said to be what originally wiped out the dinosaurs on the surface, and are still harmful to the reptilians of the Dinosaur Empire. Most of the other things they do don’t really have anything to do with evolution at all.