Getta Robot, who destroyed the Itanosaur Empire, comes back home in a miserable shape. To make things worse one of the three pilots, Musashi, died during the ultimate battle. Sadly there is no time to mourn, as the forces of a new enemy, the Pandemonium Empire, gather in space, poising for attack. Dr Saotome has barely time to release a new, more powerful machine to face them. Getta Robot G is born !