X-Men: Next Dimension begins when Bastion, the leader of Operation: Zero Tolerance, and his legions of Prime-Sentinels have captured Forge as part of their mission to eradicate all mutants. The race is on as Forge’s team mates set out to rescue their captured comrade before Bastion can coax secrets from him that are capable of destroying all mutant-kind. In order to do this, the X-Men must ally themselves with their greatest enemies, the Brotherhood of Mutants and their cunning leader, Magneto.