Vlad Masters, alias Vlad Plasmius, is a billionaire industrialist, the original founder and CEO of VladCo. An old college friend of both Jack and Maddie Fenton, Vlad is secretly a human/ghost hybrid (the first to come into existence), following an accidental college experiment he worked on with Jack and Maddie in which Vlad gained his powers. Having been such for about the last 20 years, he serves as the main antagonist of the series, acting as the archenemy to fellow hybrid Danny Fenton. He was voiced by the late Martin Mull.