Havok and Warpath separate from the rest of the group, who in turn get kidnapped by the government agency known as O.N.E. While under capture, the X-Men realize that dangerous experiments are being conducted on mutants. Havok joins forces with the Reavers and manage to infiltrate O.N.E.'s base, but are greeted with an attack by Sentinels. The Reavers then reveal that they can now integrate and absorb technology. After integrating with the Sentinels, the Reavers then turn on The X-Men but are defeated. Havok eventually surrenders himself to O.N.E. for the damage he has done, but forges a deal saying that he will take sole responsibility to clear his other teammates of federal charges, in return for not revealing to the world all of the experiments happening at O.N.E.'s headquarters. His teammates vow to free him.