X-Men: The Last Stand (2006)
When a cure is found to treat mutations, lines are drawn amongst the X-Men, led by Professor Charles Xavier, and the Brotherhood, a band of powerful mutants organized under Xavier’s former ally, Magneto.
A government-supported laboratory finds a cure for the mutants and the DNA of a powerful boy is used for it. However, the mutants must give up their powers and become human, hence splitting them.
