Add to this numerous plot inconsistencies, horrid acting, and masses of stock footage - some of which we see several times and you have a terrible but funny movie. A highly advanced alien culture is determined to destroy Earth before our scientists discover a bomb which will explode sunlight, the description Eros gives of this is quite funny. In order to destroy our world, of several billion people, they raise three zombies from the dead. I have to tell you that despite this film's horrid nature, I dearly love it for being so bad. Spacecraft developed by advanced aliens are unable to fly without wobbling.
Outer space is awful darn windy.
Pilots enter cars on the wrong side then just slide over. Fat men rising from their grave cast a shadow that looks like Darth Vader. Nobody ever just runs from the amazingly slow but indestructable undead. Sunlight can explode and destroy the universe. Revolvers use clips.