Based on the “Night of the Sentinels” animated tale, the X-Men launch a daring rescue after the young mutant Jubilee is kidnapped by Sentinels under government control. But when Uatu the Watcher steps in to frame the story as an alternate-reality “What If?”, the stakes shift. Mutants and humans clash over fear, freedom, and survival—forcing the team to defend both life and hope in a world bent on control.