Superman: Earth One its collapse. Zod addresses the United Nations, stating that the House of El caused the planet Krypton to explode, and that Superman is a threat. Zod persuades the delegates that he is an ally and wants to help them kill Superman. Lois receives a phone call from her uncle and learns that Zod is responsible for the bridge's collapse, after which she tries to warn Superman. Zod reveals that he possesses a supply of kryptonite in his ship, from whose radiation his lead-lined skin-suit protects him. He intends to kill Superman, but Superman uses his knowledge of chemistry to cause
Superman vs. Muhammad Ali as the obvious choice. Intrigued, Rat'Lar decides that Superman and Ali should fight one another to see who really is Earth's champion. To make the fight fair, he decrees that the match should take place on his home planet, Bodace, which orbits a red star (which temporarily robs Superman of his powers). The winner would simply be the best boxer. The two would-be champions decide that Ali will train Superman in the finer points of boxing. They journey to Superman's Fortress of Solitude to have his powers temporarily deactivated, and to use a time warping device to extend Rat'Lar's 24-hour