Captain Future: Kareinaru Taiyokei Race

”Terror of the Space Emperor" (1/4): On the planet Megara, strange things are happening. Humans devolve into ape-men. Sperling, one of the top agents of the Interstellar Government, who was sent out to investigate the matter, returns transformed into a beast. Captain Future and his crew are contacted. They soon discover that the bad things happening are caused by a mysterious individual who calls himself the Space Emperor...