The events of the series take place in Los Angeles. It is here, right in the center of the city, that residents discover a huge vortex that draws into itself literally everything that happens to be nearby. People caught in this strange anomaly find themselves in the distant past, in the time of the primitive Earth. It seems that now they must unite in order to survive. Meanwhile, the world left outside the vortex is trying to identify the nature of the cataclysm in order to understand how to bring the people trapped in it back. The plot will concentrate on the fate of one family, some of whom ended up in the past and some of whom remained in the present.