"UFO Robot Grendizer" is a Japanese animated television series created by Go Nagai. It first aired in 1975 and is part of the larger Mazinger franchise. The story follows a powerful robot named Grendizer, piloted by a prince named Duke Fleed, who fights against alien invaders threatening Earth. The series features a mix of action, adventure, and science fiction elements. Grendizer is equipped with various weapons and abilities, making it a formidable opponent. The show gained popularity in several countries and has become a classic in the mecha genre, influencing many subsequent works in animation and robotics.