The Greys are a shapeshifting race of aliens from the planet X. They have been studying Earth, and specifically Earths human women. They have heard that they have the most delicious milk. So one turns into a very hot muscular man, and seduces a woman named Sarah Carter that recently had a baby. He brings her aboard his space ship and him and some of the other shapeshifting aliens join in having their way with her and drinking her cream.