Morbius the Living Vampire (birth name: Michael Morbius,[1] M.D. Ph.D.; alias: Morgan Michaels, M.D., Ph.D. and Nikos Michaels, M.D., Ph.D.) is a fictional character appearing in American comic books published by Marvel Comics. Created by writer Roy Thomas and originally designed by penciler Gil Kane, he debuted as a tragic, sympathetic adversary of the superhero Spider-Man in The Amazing Spider-Man #101 (October 1971).[2] For years, Morbius frequently clashed with Spider-Man and other superheroes while occasionally regaining his reason and helping those he regarded as allies. The 1992 Marvel Comics "Rise of the Midnight Sons" crossover event then revived and revised several horror-themed Marvel characters in order to present them as lead protagonists in new titles. The event launched the new series Morbius the Living Vampire, which ran from 1992 to 1995 and now presented the title character as a lethal anti-hero and vigilante. After the cancellation of this series, various stories shifted back and forth between portraying Morbius as a conflicted and brutal anti-hero or a tragic character subject to episodes of madness and murder (once again, most often fighting Spider-Man). Michael Morbius is depicted as a famous biochemist who contracts a rare blood disease which he then tries to cure by using a combination of experimental chemicals, electroshock therapy, and genetic samples of vampire bats. The experiment mutates him into a "pseudo-vampire" or "living vampire", a life form with abilities and traits resembling, but not identical to, those of truly supernatural and "undead" creatures such as vampires (which exist in the Marvel Universe).[3] To keep his blood disease in remission, Morbius must now regularly feed on fresh human blood or face rapid illness followed by death. Initially, Morbius's mutation affects his ability to reason while experiencing hunger. This leads to blackouts and acts of violence that result in murder and villainy, occasionally followed by lucid periods during which he regrets causing harm.[3] A mixture of electricity and Spider-Man's blood restores his humanity for several years, but he later reverts to being a pseudo-vampire. During the "Rise of the Midnight Sons", a mixture of poison and genuine demon blood alters Morbius' physiology slightly while also restoring his mental capacity, allowing him greater control and awareness even while experiencing bloodlust. A new "anti-viral" serum involving Spider-Man's blood also allows him to regain humanity for hours at a time.[1][4] Concluding he now has greater control over his condition and wishing to regain some semblance of a normal life, Morbius creates a new cover identity of Dr. Morgan Michaels, while at night secretly acting as a lethal vigilante who only feeds on "the blood of the guilty." Later on, another mutagenic serum saves his life but results in Morbius once again being vulnerable to temporary madness and a loss of his faculties when his bloodlust is too strong. As a result, he abandons his Morgan Michaels identity and becomes a fugitive again.[5] The character has appeared in several media adaptations outside of comics. In the 1990s animated series Spider-Man, Morbius is a recurring character voiced by Nick Jameson. In contrast to the comics, the cartoon depicted Morbius both as a regular ally of the character Blade and as a being who feeds on human plasma through his hands rather than with his fangs. Jared Leto portrayed Michael Morbius in the Sony's Spider-Man Universe (SSU) live-action feature film Morbius (2022), with Matt Smith co-starring as Milo, a composite character also based on Morbius and several other characters.