Dr. Genzō Umon leads the Space Science Laboratory, dedicated to researching UFO sightings and related phenomena. He co-owns a ranch with his longtime friend Danbei Makiba, who handles its day-to-day operations. This ranch becomes pivotal when Dr. Umon discovers Duke Fleed, an alien survivor who crash-landed on Earth while escaping the Vegan Empire's invasion of his home planet, Fleed. Offering sanctuary, Dr. Umon provides Duke with the Earth alias Daisuke Umon and integrates him into life on the ranch alongside the Makiba family, including Danbei's daughter Hikaru. To protect Duke's true identity, Dr. Umon suppresses his memories of Fleed and the Vegan attack. Physically, Dr. Umon appears as a middle-aged man of average height and build. He has black hair, a mustache, and sideburns. His typical attire is formal: a light blue suit with a dark blue vest, white dress shirt, black neckband, and black shoes. While working at his laboratory, he wears a gray lab suit featuring light blue lining. Personality-wise, Dr. Umon is generally approachable and maintains a warm demeanor. However, his primary focus rests on his scientific duties, which can lead him to prioritize work over personal connections, including relationships at the ranch or within his adoptive family. His dynamic with Duke Fleed reflects professional support rather than deep familial bonds, stemming from Dr. Umon's view of Duke as an independent adult not requiring parental closeness. This relationship shifts when the Vegan Empire assaults Earth, prompting Dr. Umon to actively support Duke's defense efforts. He aids Duke in locating the hidden Grendizer robot, serves as an adviser during the conflict, and contributes technical expertise, such as developing the Spazer support units. Dr. Umon's scientific background spans astronomy, robotics, and mechanical engineering, demonstrated by his leadership of the Space Science Laboratory and his instrumental role in creating specialized equipment for Grendizer. His enduring friendship with Danbei Makiba is rooted in their shared passion for astronomy, leading him to periodically visit the Makiba family. During the Dragonsaurus incident—a colossal prehistoric sea monster threatening Tokyo—Dr. Umon participates in the coordinated response alongside the pilots of Great Mazinger and Getter Robo G, operating within his established role supporting Duke Fleed and the Grendizer unit.