4) The Drawing Of The Three
It’s already been confirmed that Eddie and Susannah won’t factor into The Dark Tower, but director Nikolaj Arcel has expressed a desire to introduce them in a follow-up should this first instalment perform well enough. However, just because these two key members of Roland’s ka-tet won’t show up here, that doesn’t mean we can’t at least get some sort of tease about their existence.
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For starters, we should definitely see characters using doors to travel between realities, as that alone lays the groundwork for Roland to bring these two into Mid-World at a later point in the story. Some sort of hint at the end that Roland and Jake need to find them would be ideal, and while a mid-credits scene featuring a door appearing on a beach labelled with “The Prisoner” or “The Lady of Shadows” wouldn’t mean much to non-book fans, for those familiar with the source material, it would be an amazing tease.