Marvel Comics X-Factor #15 (April 1987), first appearance of the Horsemen of Apocalypse

X-Factor #15 was published by Marvel Comics in April 1987 and marks a significant milestone in X-Men mythology as the first appearance of the Horsemen of Apocalypse. This issue features the transformation of Angel into Archangel, one of the most dramatic character evolutions in Marvel history. The storyline was written by Louise Simonson with artwork by Walt Simonson, representing a pivotal moment in the mutant saga that would influence X-Men narratives for decades to come. This comic is highly sought after by Marvel collectors and X-Men enthusiasts who appreciate key first appearances and character-defining moments. The introduction of the Horsemen of Apocalypse represents a major turning point in X-Men lore, making this issue essential for serious Marvel collectors. Fans of 1980s Bronze Age comics particularly value this issue for its historical significance in the X-Men universe and its role in one of the franchise's most memorable story arcs.