Cruel aliens want to throw waste material from experiments into the disposal facility - a pregnant woman in an iron cage. However, thanks to her son Johnny, she remains alive. The cell is thrown onto the planet and the alien ship flies away. A woman gives birth to two children: a boy and a girl. A few years later she dies, but her children remain on the planet. They live well in a peaceful tribe of almost intelligent animals who saved and sheltered them that terrible night, until curiosity pushes them to search for clues to an unusual, previously inhabited planet. The arrival of a ship with people further complicated the already difficult life of the grown-up children.