During the battle with the House of M, the Scarlet Witch changed reality, genetically altering over ninety percent of the world's mutant population and only leaving a few hundred with their powers as a result. During the aftermath of M-Day Peepers is seen with Mammomax and Erg on the run from the Sapien League. He comments that the X-Men hate them but Mammomax replies that the X-Men are heroes and won't turn them away, all three are caught and almost burned alive at the Xavier Institute's doorstep if not for the timely arrival of Wolverine and Colossus. However he becomes lost in the confusion of the Sapien League's attack and the arrival of the Sentinels, but he meets up with Outlaw who is also on her way to the Xavier institute for the promised sanctuary. The two become caught up in the fight between the Sapien League, the O*N*E* soldiers, and the X-Men all before reaching the mansion. Peepers stays quiet and out of the way of most of the other members of the 198. He is one of the mutants that receives a "tracking" chip and then later has it removed by Mr. M and follows him when he leads his exodus from the institute.