The Green Slime

Space station Gamma 3, commanded by Vince Elliott, detects an asteroid of second class (6 millions tons), whose race would result in a collision with the earth. Jack Rankin goes on the space station Range 3. He is designated to lead a delicate operation. With a team, he has to land on Flora, the asteroid, and to make it explode before it strikes the Earth. But what they'll bring back will put in peril the whole of humanity...