In 2066, the Republic of Hontworl, a member of the United Nations, withdrew from the organization without providing any reasons. This led to an uproar within the U.N., and it put the world's security at risk. Following this event, Myori, the capital city of the Republic of Triad, was attacked by a flying fortress known as the Turtle King. The International Science Organization (ISO), headed by Dr. Kouzaburou Nanbu, was tasked with dealing with this mysterious enemy. However, soon after, the leading scientists of the ISO began to disappear. As a result, the five members of the Science Ninja Team, also known as the Gatchaman warriors, were called upon to investigate and defeat this new threat. Although it had been many years since they fought against Berg Katze and the Galactor organization, Ken, also known as the Eagle, would lead his team once again in a battle against this supreme force of evil.