The Valorians were a species of peaceful humanoids that lived on the planet Valoria until they were invaded by the predatory Rulons. A group of Valorians lead by Questar attempted to escape the Rulon invasion using a spaceship equipped with their "Space Time Energy Projector" (S.T.E.P.); however, something went wrong. They were sent back in time and space, to the planet Earth 65 million years back to the age of the dinosaurs. Unknown to them, the Rulon flagship, the Dreadlock, locked in with a tractor beam, was also sent back through time when the S.T.E.P. was activated.
After successfully landing on prehistoric Earth, the Valorians used their AMP ("Amplified Mental Projector") necklaces to telepathically communicate with the dinosaurs they encountered and eventually befriended them. On the other hand, the Rulons - led by the warlord Krulos - used brainwashing devices known as brain-boxes to control dinosaurs for their own needs. The Rulons then launched an attack on the Valorians, who called upon their dinosaur friends to assist them in fighting back. After ultimately defeating the Rulons, the Valorians renamed themselves Dino-Riders.
