The Mighty World of Marvel #12

In "The Metal Master!", the Hulk faces his most formidable foe yet when an alien warlord wielding mind-bending metal powers invades Earth. With his gamma transformations failing and his human form exposed, the Hulk finds himself captured by General Thaddeus "Thunderbolt" Ross, forcing Rick Jones to rally the Teen Brigade in a desperate bid to save him. As the alien's power threatens to overwhelm them all, the Hulk must find a way to fight back—before the Metal Master claims victory.