The Lead Seatopian Agent was the senior of two Seatopian agents sent to the surface world by Emperor Antonio. Both he and his partner were assigned to steal the robot Jet Jaguar, to act as a guide for Megalon. They were also assigned to capture Jet Jaguar's inventor Goro Ibuki and take him back to Seatopia so they could create an army of Jet Jaguars. Although they succeeded in the first half of their mission, they failed in their second. The lead agent was killed when Megalon, going berserk after Ibuki regained control of Jet Jaguar, sent a boulder flying through the air and it landed on the agent, crushing him.