科学忍者隊ガッチャマン
is the direct sequel to "Science Ninja Team Gatchaman", set two years after the first television series. After the defeat of Leader X, he exacts his revenge by mutating a young girl into Gel Sadra, making her the new leader of Galactor. While Galactor returns, Dr. Nambu and the International Science Organization bring the Science Ninja Team Gatchaman back into active duty. This series and "Gatchaman F" would be the basis of the English-language version named "Eagle Riders". Sentai Filmworks has licensed the series and released the complete series on DVD on April 18, 2017.