Hector travels with Luisa by the road linking Madrid with Barcelona. When another car suddenly crosses his path, his vehicle leaves the road and plunges into a tree. Hector dies and she is seriously injured. The other car was occupied by Jorge and Paula, her lover. Several vehicles cross before the car crash and do not stop, each for a different reason. Among them is Julio, a truck driver who does not stop in order to reach his destination on time, not knowing that at the wrecked car travels his old girlfriend.
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A wrestler is arrested on suspicion of assault, but his son manages to capture the real culprits.
Landru, a French businessman, arrives Mexico with the idea of promoting their fighters, what nobody knows is that besides Landru promoter and fighter is a mad scientist who seeks to alter human genetics mixing it with the animal to make stronger and fiercer to their gladiators.
