"Getter Robo" is a seminal mecha anime series that revolves around the conflict between humanity and an ancient reptilian race known as the Dinosaur Empire. The story begins with the discovery of Getter Rays, a mysterious energy source, by Dr. Saotome, a brilliant scientist. Recognizing the potential of this energy, Dr. Saotome develops three powerful combining robots—Getter-1, Getter-2, and Getter-3—each piloted by a different individual. These robots can combine into various forms, known as Getter Machines, to adapt to different combat situations.

The primary pilots are Ryoma Nagare, a hot-headed and skilled fighter; Hayato Jin, a disciplined and strategic martial artist; and Musashi Tomoe, a gentle giant with immense strength. Together, they form the Getter Team, tasked with defending Earth from the Dinosaur Empire's relentless attacks. The Dinosaur Empire, led by Emperor Gore, seeks to reclaim the surface world from humanity, which they view as usurpers. The empire deploys a variety of monstrous mechanical dinosaurs and other bio-mechanical creatures to achieve their goal.

As the series progresses, the Getter Team faces increasingly formidable enemies, including powerful generals and advanced war machines created by the Dinosaur Empire. The narrative explores themes of teamwork, sacrifice, and the ethical implications of wielding immense power. The pilots must not only battle external threats but also confront their own personal struggles and the moral dilemmas posed by their role as defenders of humanity.

The story is marked by intense battles, dramatic confrontations, and moments of introspection as the characters grapple with the weight of their responsibilities. The series also delves into the origins of the Getter Rays and their connection to the ancient conflict between humans and the Dinosaur Empire, adding layers of mystery and intrigue to the overarching plot.

"Getter Robo" is notable for its dynamic action sequences, innovative mecha designs, and the complex interplay between its characters. The series has had a lasting impact on the mecha genre, influencing numerous subsequent works and establishing itself as a classic in the realm of anime.