In the fourth chapter after the events of “Cosmic Confrontation” that led to the death of a member of the X-Men (Thunderbird), the heroes' world is about to collapse when the Phoenix, a cosmic entity of unimaginable power, returns and threatens to swallow them up. planet Earth in flames. With Jean Gray possessed following the traumatic events of her confrontation with Ord, the battle for Jean's soul and humanity's survival becomes the center of the narrative leading up to this Avengers/X-Men crossover. This movie is what closes The Mutant Saga (Phase 9)