Kagaku ninja tai Gatchaman

A mysterious UFO flies over cities and mountainous regions all over the world. Additionally, airplane passengers who vanished half a year ago appear again, without memory. Because the spaceship has come to request to talk with humankind, the Science Ninja Team undertakes the task on a remote island in the South Sea. The person who exits the space craft is the famous Earth Defense Force pilot Major Borg, who was believed to be dead, killed in combat against Galactor. He says that when he was saved by that spaceship, Kentaro Washio was alive inside that ship. When Ken learns that his father, who sacrificed himself to save the Earth, is alive, he sways. He takes off in the G-1, following the UFO which took off after Borg exited. He sees his father through a window, but then crashes against a wall. Borg saves him and, led by Borg, Ken leaves in order to meet his father. Borg's son has been taken hostage by Galactor and Borg has been forced to set a trap for Ken.