Earth Energy is a natural force produced by the planet's rotation, and it has drawn unwanted attention from space. A mysterious alien enemy called Dark Spinner invades Earth with the aim of seizing that energy and turning it into Dark Energy. Standing against the invaders are twin brothers Raiga and Kuga, who fight alongside Earth Granner, a secret defense team dedicated to protecting the planet. Built around Takara Tomy's Tomica toy car line, this 51-episode mecha action adventure from 2020 pits the brothers and their allies against Dark Spinner's ambitions, with combining machines at the heart of the battles.