The X-Men #58

In "Mission: Murder!", the X-Men face a chilling threat as Sentinels hunt down mutants worldwide, culminating in Iceman’s capture and imprisonment at Trask’s base—where he reunites with Lorna and his brother Alex, now known as Havok, both restrained in containment suits. With Beast barely escaping and Angel racing back to the States with Cyclops and Jean close behind, the team’s survival hinges on a desperate gambit. Written by Roy Thomas and illustrated with striking intensity by Neal Adams—whose dynamic pencils and inks define the issue’s tone, with Tom Palmer’s inks adding depth—this pivotal 1969 Marvel classic features a cover by Adams and Palmer that captures the urgency of the moment.