The Dark Phoenix Saga

Published in 1980, The Dark Phoenix Saga was written by Chris Claremont with art by John Byrne in Uncanny X-Men issues #129-138. The saga follows Jean Grey's transformation into the Dark Phoenix, a being of immense power and destruction. The story begins with the X-Men battling the Hellfire Club, who seek to manipulate Jean. Their interference triggers the emergence of the Dark Phoenix, leading to a cosmic conflict that threatens the universe. Key characters include Jean Grey, Cyclops, Wolverine, the Hellfire Club, and the Shi'ar Empire. The storyline culminates in Jean Grey's sacrifice on the moon. The arc has been adapted into animated series and films.