Morbius, The Living Vampire

Nobel Prize-winning biochemist Dr. Michael Morbius discovered he was dying, a rare disorder dissolving his blood cells. Not wanting to distress his fiancée Martine, Morbius began secretly working on a cure. With the aid of his partner Emil Nikos, Morbius attempted using distilled fluids from bats to stay his disease.

While experimenting with such serums on board his yacht, Morbius had Nikos run an electrical shock through his system. The combination profoundly changed Michael’s body, transforming him into something resembling a vampire.  More on Marvel.com