* Are the girls HumanAliens in the same way ''Doctor Who'' is, rather than HumanoidAliens?
** For the most part, they are human aliens, with no biological differences that can be discerned. The difference is that they can interact with/control/sense energy. move objects with their minds and when necessary, convert to an energy form. In their corporeal form, the only departure from standard biology is that they need to absorb massive amounts of electrical energy once per day.