X-Men: Apocalypse: Comic Book Origins of The Four Horsemen

The inclusion of Apocalypse/En Sabah Nur's Four Horsemen is an exciting turn for the franchise.

Apocalypse (En Sabah Nur) Powers, Enemies, History

First Appearance of Archangel and the Origin of Apocalypse

Age of Apocalypse Reading Order - Comic Issue Checklist

Marvel United: X-Men – The Horsemen of Apocalypse, Board Game

X-Men: 10 Of Apocalypse's Best Horsemen (And 10 That Were Unworthy)

You Don't Know Apocalypse

Horsemen of Apocalypse, X-Men Movies Wiki

Horsemen of Apocalypse (Team) - Comic Vine

X-Men Red #17 Review — Major Spoilers — Comic Book Reviews, News, Previews, and Podcasts

Who Is Apocalypse? A Primer to 'X-Men: Apocalypse

X-Men: Apocalypse (2016) - IMDb