When a secret operation fails, Mobile Suit ace Amuro Ray and his squad become marooned on an isolated isle. Their unit was dispatched to the place known as the Island of No Return to eliminate hostile troops, yet they encounter a band of youngsters and an opposing mech assault. Amuro now has to devise a plan for everyone"s escape from this enigmatic territory, but first he encounters an odd figure—the mysterious Cucuruz Doan.