 The titular space aliens are energy vampires, rather than the familiar stereotypical Earth vampires that suck blood and change into bats.They consume the "life force" by seducing living beings with a deadly kiss and also have the ability to take control of the willing host bodies of their victims.Though the aliens' initially appear to be humanoid bat-like creatures, they are subsequently shown to be squidlike, but ultimately revealed to be insubstantial energy-beings from a higher dimension.