He's G-4!

The message is intercepted that Galactor spies will sneak into Utoland City. With a funny look to the Science Ninja Team, who are guarding the frontiers, the spies just walk in. Meanwhile, Jinpei meets a hippie named Dave and decides to have him work at the restaurant. Jinpei leaves the work to Dave and goes out in his buggy. He is stopped by a suspicous looking policeman for driving as a minor without license. Seizing an opportunity, he flees, but gets hurt. Dave eagerly acts as Jinpei's male nurse and Jinpei starts to have feelings towards him like towards a father. But Joe thinks Dave is suspicious and watches him in the very act of communicating with Katse. Ken and the others use Dave to set a trap. They don't tell Jinpei on purpose, but he hears the conversation on his bracelet. He feels responsible and goes alone to the place where Katse is supposed to be lured. When they learn that, the four other team members and Dave race to the place. There, the Chessknight mecha is waiting. Dave wants to rescue Jun and Jinpei, who are hanging from the ceiling of a bridge. He is pushed by Katse to tell him what the true faces of the Science Ninja Team look like. Dave says nothing and pulls up the two team member. Katse blows up the bridge. Jinpei is saved by the G-5 craft. He thinks that Dave left not as a Galactor spy, but as a friend and cries at Jun's chest.