Because pratically it has no valuable plot. Only the sequence of a series of sometimes violent scenes caused by the sudden presence of a strange living unknown creature that must be chased and killed or expelled. This occurs in a spaceship where its crew is turning home And that is all about this movie along its projection. The positive thing is only the real conception of the apaceship interior with all its apparatus, tools appliances, machines and buttons. At a certain moment the scientist member of the crew reveals himself of being a robot for the surprise of the others. It ends by the death of all the crew nenbers except one that manages herself to get away before the final explosion and destruction of the spaceship. And that is all.
