Senator Kelly is abducted by Magneto's allies Toad and the shapeshifter Mystique and brought to their lair. Magneto uses Kelly as a test subject for a machine that artificially induces mutation. Kelly uses his new mutant abilities to escape imprisonment. After an accident causes Rogue to use her powers on Wolverine, she is convinced by Mystique (disguised as classmate Bobby Drake) that Xavier is angry with her and that she should leave the school. Xavier uses his mutant-locating machine Cerebro to find Rogue at a train station. Mystique infiltrates Cerebro and sabotages the machine.