Space Runaway Ideon

While excavating the ruins of the planet Solo, humans uncover mysterious mechas. Their discovery is interrupted when an alien named Baff Kuun invades, searching for the limitless energy source called "Ide." With humanity on the verge of defeat, three mechas-piloted by a young Earth boy named Yuki Cosmo and his allies-merge into a single colossal robot, the Ideon. Harnessing its immense power, they stand against Baff Kuun's forces.