Grant Douglas and Jack Parrish embark on a mission to investigate a mysterious asteroid that has been emitting unusual signals. As they approach the asteroid, they discover it has an atmosphere and signs of life, which is unexpected for such a small celestial body.Upon landing, they find themselves in a strange and hostile environment. The asteroid is home to bizarre and dangerous flora and fauna, but the most shocking discovery is a colossal, monstrous creature that dominates the landscape. This "monster of the asteroid" appears to be a remnant of a bygone era, possibly a survivor from a planet that was destroyed, leaving only this fragment and its monstrous inhabitant.