Kidou Senshi Gundam: Uchuu no Ixtab

In Universal Century 0079, following the Principality of Zeon's formal declaration of war, the Earth Federation's Magellan-class battleship Toutatis intercepts a Musai-class cruiser en route to Side 2. The ensuing confrontation forces both vessels into an uncontrolled crash landing within the Island Iffish space colony. Upon breaching the interior, the surviving crew members are met with a horrifying sight: a vast landscape entirely eradicated by poison gas. This devastating discovery reveals Zeon's true objective—a calculated plan to drop the massive colony directly onto the Earth's surface. Faced with this apocalyptic threat, the crew of the Toutatis resolves to prevent the catastrophe at any cost. Armed with a nuclear warhead, they prepare a desperate operation to destroy the colony from within before it can be weaponized against the planet below. However, their mission is complicated by an unexpected variable inside the structure. A Zeon Zaku platoon has coincidentally infiltrated the colony under separate orders, tasked with suppressing internal dissent and silencing opposition among their own allied forces. As these two factions cross paths in the toxic ruins of Island Iffish, a tense and deadly conflict unfolds amid the looming shadow of global annihilation.