A strange giant object is approaching the Earth, it is a Wandering planet that has lost its orbit and is moving on a fast trajectory towards the interior of the solar system. Initially it is believed that it will crash into our planet, but actually its fate is different: it is on its way to collide with the Sun. Observations of the characteristics of the space object and some pieces of its crust that fall on our planet reveal an extraordinary discovery: it is exactly the same as Earth.

The surprise is even greater when it is discovered that each Earthman has an exact version of himself on the other planet. Studies propose a way to save the inhabitants of the Wandering planet: each inhabitant of the Earth must synchronize their decisions with their other self through a test. When both beings are able to make the same decisions for a certain time, an entanglement is created that teleports the alien version to planet Earth, saving itself from the apocalypse.