Making an acute case for the fact that this cover was probably just a stock X-Men pin-up, both Jean Grey (in Phoenix guise) and Banshee appear on the cover, but neither one is in the story.
Claremont penned a sequel to this story in X-Treme X-Men #25-30; Even though at the time of production, with this 1982 one-shot story being his only appearance, Stryker, in a modified form, was the villain chosen to be the X-Men's main antagonist in the movie X2.
Text article with clip art; A new look by Claremont at the inspiration and impact of the story 21 years after it was first presented.