Inseminoid (1981)
A group of scientists are working on a freezing cold planet excavating the ruins of an ancient civilization believed to have lived there. Soon one crew member starts showing signs of being possessed and another one, Sandy, is attacked and impregnated by a creature there. At first she seems to have survived the ordeal intact but soon starts behaving weirdly and eventually starts killing her colleagues and drinking their blood in order to protect her rapidly growing fetuses.
