Secret information regarding the Science Ninja Team is stolen.
Nambu orders the Science Ninja Team to investigate why the ISO scientist Boronbo acted as a spy and to stop any data from reaching Galactor.
Ken pretends to be a Galactor and contacts Boronbo. He learns from Boronbo's story that his daughter has been taken hostage, but before Ken can introduce himself, Boronbo locks him up in his own house and goes away with the data.
Through Ken's message, Joe and the others discover Boronbo's car near the ISO headquarter. Under a red sportscar, which is besides Boronbo's car, they discover the entrance to a subterranean base. The four of them are dropped from an elevator, but Ken who arrives late, saves them.
The Science Ninja Team is beleaguered by Galactor members. In the middle of the confusion, Ken pursues the fleeing Katse and secretly joins him in a mecha going to another base. After Katse has noticed Ken, he wants to blow him up with the base. He installs a timebomb and escapes with the data. Ken has discovered Boronbo's daughter in the base and takes her with him, escaping from the base.
Elsewhere, Katse is baffled at the data disappearing. Boronbo has cleverly arranged that the data is erased when the switch is turned.
Rumi says that she would like to see the face of her benefactor. Ken covers his face and hands her over to Boronbo. In the train on their way back, Ken has dissolved the transformation and when Rumi passes him without noticing him on her search for Gatchaman, he picks up her fallen rose and looks at it for a long time.
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