Piloting Getter Robo G in the animated crossover film "Grendizer, Getter Robo G, Great Mazinger: Kessen! Daikaijuu", Ryōma Nagare embodies his television adaptation's characterization—a former football player—rather than the manga's more violent iteration. In this non-canonical tale, he joins forces with the pilots of Grendizer and Great Mazinger to battle the Dragonsaurus, a colossal sea monster menacing Tokyo. When the combined robots' initial assaults fail against the creature's regenerative resilience, Hayato Jin proposes targeting its oil-filled body. Ryōma seizes the plan, unleashing Getter Robo G's Shine Spark to ignite the internal oil, destroying the beast and rescuing the city. Throughout the mission, his interactions with fellow pilots stay mission-focused, showcasing a cooperative yet action-driven approach fitting the crossover's ensemble dynamic.