Kagaku ninja tai Gatchaman

The ISO and the UN have developed a special radar to search for the main beam cannon. But Galactor learns about this, and during one of their attacks, Chief Anderson is badly hurt. Gel Sadra wants to reveal the true face of Gatchaman. Since she doesn't know what he looks like, she starts attacking one employee of the ISO after the other. Ken feels sorry about all the victims. Meanwhile Sam, the grandson of Chief Anderson, is captured. In order to avenge his grandfather, he pretends to be Gatchaman and is tortured mercilessly. Ken has secretly sneaked into the base as a Galactor member. However, Gel Sadra notices the unknown trooper and has him unmasked, thus revealing his true identity. Ken goes into bird style, rescues Sam and charges at Gel Sadra. She flees, leaving behind the menacing words "Stupid Gatchaman! I have now seen your true face, the next time I will win for sure!" The enemy base becomes the Mecha Sentango and starts creating havoc.