In the film, a pharmaceutical company has developed a suppressor of the mutant gene, provoking controversy in the mutant community. Magneto declares war on the humans and retrieves his own weapon: Phoenix, the resurrected former X-Man Jean Grey. A final battle between the X-Men and the Brotherhood ensues, and Wolverine must accept that in order to stop Grey, he will have to kill her. It is the third installment in the X-Men film series.