An unusual marine creature, octopus, is arranged to do an experiment in the space laboratory. Due to a mistake during the experiment, the octopus is bombed by high energy particles in space. The DNA of the octopus is modified and has gene mutation. The octopus with gene mutation is placed in a space garbage bag wrongly. The octopus with gene mutation escapes into space. Under denser high energy space particle bombardments, it becomes a big monster in universe. It begins to attack human beings on moon, on Mars and in space. In order to get rid of the big space monster, people begin to search, fight and destroy the big space monster. The battle between human beings and the big space monster becomes a huge event in daily life.