Esta serie sigue a un equipo alternativo de X-Men mientras viajan a través de universos paralelos para salvar a los mutantes del genocidio. Los héroes se enfrentan a amenazas en innumerables realidades, lidiando con sus propias inseguridades y adversarios formidables. Es una aventura épica que mezcla tropos clásicos de superhéroes con giros audaces, explorando lo que significa ser un mutante en un vasto multiverso.
Forming an all-new team are the veterans Storm, Bishop, Psylocke, Thunderbird, Rogue and Beast. They are joined by new mutants including Sage. Together, they are charged with finding the mysterious Books of Destiny -- journals on which the fate of the world rests.
The X-Treme team takes the field of battle as Earth's last line of defense - and ultimately, its only hope - against an alien armada capable of enslaving entire dimensions.