Nightmare, malevolent lord of the Dream Dimension, is drawing power from the Mindscape and using it to transform the deepest fears of Earth's mightiest heroes into dangerous dungeons designed to break them. Scarlet Witch, Moon Knight, and Captain America each find their dreams weaponized against them. Doctor Strange and Sleepwalker arm their allies with dream energy and send three-hero teams into the heart of each nightmare — to defeat the fear, neutralize Nightmare's hold, and stop the collapse of reality before it becomes irreversible.