Something arrived by the spaceship, 20 million years ago when Antarctica started freezing. Something happened to the ship, it lost control and made an emergency landing. When landing it crashed into the granite rock. It came to light and froze. It was dug out by scientists. Its look is described by Campbell "In a skull of a strange form still the ice axe fragment stuck out. Three mad, filled with hatred of an eye burned with live fire. Instead of hair the head was framed by disgusting coiling rough worms."
Capture of the whole world, by transformation of all terrestrial individuals into the similarity was the purpose Something apparently. Only unsuccessful place of disembarkation rescued our planet. Something didn't want to kill all people at station - it wanted to get out on the continent.
Something read mind and inspired thoughts, however, only when the person sleeps.
"The damned creature not only could read foreign mind, but also project the. He not had dreams, he telepathic perceived thoughts of the newcomer, just as we now listen to his mutter in the sleep."
Something possessed ability to maintain a long freezing because quickly enough recovered. It is capable to turn into any living being.