Of the five new hosts of the Phoenix, only Cyclops and Emma remain.
The X-Men and the Avengers seek the wisdom of Charles Xavier.
Back on Utopia, Emma wants to “burn this world down and start from scratch”.
Xavier confronts Cyclops in an attempt to reason with him to stop the Phoenix. Cyclops lashes out at Xavier for criticising his “bold vision” that saved mutantkind when Xavier sat back and did “nothing”.
When Cyclops does not stand down, Xavier commands the X-Men and the Avengers to attack Cyclops and Emma. Determined to win the fight, Cyclops turns on Emma and draws her portion of the Phoenix out of her, and assumes the Phoenix as the single host.
With the full power of the Phoenix, Cyclops kills Xavier. He then turns into the Dark Phoenix.