Sleepwalker

Sleepwalker is an alien guardian of the Mindscape — a dimension bordering human consciousness — who becomes trapped within the mind of college student Rick Sheridan. While Rick sleeps, Sleepwalker can enter the waking world to protect it from threats.

Few characters capture the eerie, dreamlike fringe of the Marvel Universe quite like Sleepwalker, who first materialized in Marvel Age #100 in 1991, conjured by the creative team of Bob Budiansky and Bret Blevins at the dawn of the Modern Age. A genuinely offbeat presence in Marvel's roster, this character has lingered in the publisher's consciousness for over three decades — a testament to the kind of cult staying power that collectors quietly treasure. Sleepwalker's journey through the Marvel Universe has brought them into orbit with some serious heavy-hitters: Spider-Man, Iron Man, and Ms. Marvel herself have all shared the page across titles like Ms. Marvel, Beyond!, and Avengers: The Initiative. With a key issue on the record and 35 catalog appearances spanning 1991 to 2023, Sleepwalker is exactly the kind of deep-cut Marvel curiosity that rewards the fan willing to look a little beyond the front shelf.