When Dr. Claw returns again, the retired Inspector Gadget is summoned out of the mountain again.This time, with the strong assistance of Penny and Brain, he put on the battle robe and shouldered the important task of stopping his old enemy.The three of them fought side by side, family affection, wisdom and loyalty intertwined into a new chapter, and what they faced was not only an evil conspiracy, but also a test of time and memory.