Melmacians are a species of short-statured sapients of mammalianoid evolutionary background. They are relatively long-lived, having a lifespan of around 650 years. By the inclusion of a plant called the Carl Shrub in their diet, Melmacians are also immune to infectious disease, awkward conversations, psychiatric conditions, the Jedi mind trick, dance fever, Jerry Williams, and stepping in gum. Should a Melmacian ever travel in time, he will inevitably stop a plane from crashing and inadvertently prevent a presidential scandal.