Comics › X-Factor #20 Image 1 of 1 X-Factor #20 $4.99 The aftermath of X-Factor's battle with the Horsemen of Apocalypse. Written by Louise Simonson with art by June Brigman. Add To Cart Added! The aftermath of X-Factor's battle with the Horsemen of Apocalypse. Written by Louise Simonson with art by June Brigman.