The leader of the X-Men and the leader of the Avengers size each other up in this epic brawl from writer Paul Allor and Alessandro Miracolo! Drawn to the Alaskan wilderness by magic neither of them understand, Captain Marvel and Cyclops duke it out! Agatha Harkness' plan for the Darkhold is slowly taking shape...but will it come at the expense of two of the world's greatest heroes?! And what can an energy-blasting mutant do against a woman who can absorb the energy of the sun?!