What is the Interloper? The Highlander of the Undead. In a 48 page graphic novella, the Grim Reaper creates his own knight to destroy all Earthly undead. In this origin story, the Patriarch of Death creates a Grim Knight called the Interloper to preserve a universal balance of mortals and immortals in a supernatural story full of werewolves, devils and a were-rabbit named Bounty.