Kagaku ninja tai Gatchaman

In a Galactor base at an upper course of the Amazon, a new weapon using Hypertonium is produced. The base is protected by the mechanical plants which surround it and push back any invader. Jinpei is investigating the area around the river when somebody attacks him and shoots him down. He is saved from the piranhas in the river by some local children. The team rejoins him and brings back the Helicopter and the bracelet Jinpei lost during his escape. Jinpei is ordered to remain on standby while the team searches the Amazonas. However, Jinpei somehow ends up in the difficult situation of going with the children into the interior of the Amazonas in order to pick up a legendary, blooming blue orchid. They detect Galactor troops, secretly follow them, and discover a Hypertonium transport vessel. However, Jinpei and the children are discovered and captured.