Uchuu no Hou: Reimei-hen

Ray, Anna, Tyler, Halle, and Eisuke appear to be ordinary university students, but they secretly fight Reptilian invaders from space. When Tyler disappears after falling into a trap laid by the alien Dahar, Ray travels 330 million years into Earth's past to find him. He arrives in an age when Alpha, the god of Earth, is preparing to establish a new civilization and has invited Queen Zamza and other Reptilians from planet Zeta to take part in it. As Ray searches for Tyler and uncovers Dahar's intentions, he is drawn into an ancient plan whose consequences reach far beyond the era he came to save.