The Gigantic Mechanical Brain Gillvalis and the Galactron Army, intent on wiping out all intelligent lifeforms in the universe, close in on Earth. Riku Asakura heads for Okinawa, where there are said to be clues to the “Red Steel” sought by Gilbaris. There, Riku encounters Ail (Yuika Motokariya), who realizes that he is Ultraman and assigns him an important mission.
