Each chapter of the crossover features a short back up strip titled "The High Evolutionary" which was written by Mark Gruenwald with pencil art by Paris Cullins and Ron Lim. This 11 part story details the origins of the High Evolutionary, his previous storylines, and key events in which he participated (such as the origins of Spider-Woman, Quicksilver, and the Scarlet Witch). The series concludes by revealing how the High Evolutionary survived his apparent suicide and began plotting the Evolutionary War.