Interloper

Interloper is an ancient, immortal human warrior who has spent millennia battling the demonic Dragon of the Moon, eventually emerging from his long, secret struggle to join the Defenders in confronting mystical and cosmic threats alongside heroes like Doctor Strange and Valkyrie.

Emerging from the twilight of the Bronze Age in 1985, Interloper is one of Marvel's more enigmatic figures — introduced by Peter B. Gillis and Don Perlin in The Defenders #147 and immediately thrust into some seriously charged company, sharing adventures with the likes of Valkyrie, Brunnhilde, Andromeda, Manslaughter, and Stephen Strange himself. Their appearances cluster around the mystical and cosmic corners of the Marvel universe — The Defenders, Strange Tales, and the Doctor Strange, Sorcerer Supreme series — which tells you everything about the atmospheric, otherworldly territory this character calls home. With a collector-recognized key issue and a presence that has quietly persisted across more than three decades, Interloper is exactly the kind of deep-cut Marvel mystery that rewards the curious fan willing to dig past the marquee names.