In 2066, the Republic of Hontworl, a founding member of the United Nations, withdraws from the organization without stating its reasons. This act sparks outrage within the U.N. and puts global security on edge. Shortly after this event, Myori, the capital of the Republic of Triad, is attacked by a bird-like flying fortress called the Turtle King. The International Science Organization, led by Dr. Kouzaburou Nanbu, is assigned to handle this mysterious threat. Meanwhile, top ISO scientists are vanishing. The five members of the Science Ninja Team, the Gatchaman warriors, are summoned to investigate. Years have passed since the team battled Berg Katze and the notorious Galactor organization. Can Ken, also known as the Eagle, still guide his team to victory against this ultimate evil?