Space Parasite

Few villains can claim a Silver Age debut opposite the Jade Giant himself, but Space Parasite burst onto the scene in The Incredible Hulk #103 in 1968, courtesy of Gary Friedrich and the incomparable Marie Severin. This Marvel cosmic menace has kept genuinely formidable company over the decades — sharing pages with heavy-hitters like Terrax the Tamer, Paibok, and Tyros — and resurfaced decades later in the Annihilation event, proof that a character born in the Bronze Age's shadow can endure nearly forty years in the Marvel cosmos. Rare in the catalog and steeped in Silver Age DNA, Space Parasite is exactly the kind of deep-cut discovery that makes digging through Marvel's cosmic corners so rewarding.