In a futuristic war, the evolved human race known as the Valorians are trying to save the galaxy from Krulos and his army of mixed-species Rulons. In an effort to escape a Rulon onslaught, Questar, the leader of the Valorians, turns on a machine that takes them all back in time to prehistoric Earth.

Once there, the war continues with the Valorians using their psychic abilities to convince dinosaurs to aid them, and the Rulons using machinery to enslave dinosaurs to fight for them.