Nightmare, the mystical foe of Dr. Strange, falls in love with a human woman–a horror movie actress. And apparently he has the power to put suggestions in human minds that come true–so he basically mind-rapes her into loving him back.
From there, it gets weird. Ann Nocenti at her Nocenti-est. The director of the horror movie invents a device that goes in theater seats and taps the nightmare dimension, to make the horror movie even scarier. Nightmare’s minions take over his dimension while he’s busy on Earth. But in the end, everything is back the way it was.