Fifteen years before other manga series, Getter Robo introduced the innovative concept of combining and transforming robots. Millennia ago, Getter Rays appeared and caused dinosaurs to retreat underground and evolve into intelligent beings that held a grudge against humans who lived on the surface. To protect against their attacks, Professor Saotome used these mysterious rays as the power source to create Getter Robo. The three pilots, Nagare Ryoma, Jin Hayato, and Tomoe Musashi, operate combat jets that can transform into three separate powerful robots with distinct abilities: Getter-1 wields an axe and can fly, Getter-2 carries a quick drilling weapon, and Getter-3 is a tough tank-like robot.