Stone Age, the time of mammoths and cave bears. A young Belka from the Kaya tribe is expelled from her native village - in order to become an adult, the girl must pass tests and receive a real name. But everything changes when mysterious “iron birds” attack the Kaya village and kidnap all the people. Now, in order to find a name, Belka will have to find her tribe. And she still doesn’t know that the path lies far to the north, to the Pangea experimental base. Where a mysterious woman with half a face conducts monstrous experiments on people.