Txomin, an unemployed Basque archaeologist, is commissioned to carry out a survey on Mars. With his brother Gene at the wheel, they set off from Eibar on an adventure through northern Spain. Gene’s fragile health and a toxic mist that mysteriously appears make them turn off the road and go to his sister Mila. The reunion of the three awakens old family grudges as Gene’s health worsens. With the help of some ghosts and Jesus Christ himself, the two brothers decide to finish their mission and reach Mars.