Nightmare

Nightmare is an extradimensional demon lord who rules the Dream Dimension, a realm where he feeds on the psychic energy of sleeping humans. He has menaced Doctor Strange since Strange's earliest adventures as Sorcerer Supreme.

Born in the Silver Age nightmare fuel of Strange Tales #110 (1963) — courtesy of Stan Lee, H. E. Huntley, and Dick Ayers — Nightmare has haunted the Marvel Universe for over six decades, making him one of the most enduring figures in the publisher's supernatural corner. With 104 catalog appearances spanning from 1963 all the way to 2025, this is no footnote villain but a persistent presence, most at home in the shadowy pages of Doctor Strange, Sorcerer Supreme, and Strange Tales. He keeps genuinely elite company, sharing his darkest chapters with Stephen Strange, Spider-Man, Wolverine, and Peter Parker — a rogues' gallery of Marvel's finest facing something that clearly unsettles even the mightiest. If you're diving into Marvel's mystical and horror traditions, Nightmare is exactly the kind of Silver Age original worth tracking down.