The bad guys and they are bad in every way (They all look like rejects from the Planet of the Apes), have created a mechanical Godzilla -- a *Mecha*godzilla! With which to take over Earth! First they send it off disguised as Godzilla but Angiurus knows better and they fight. Then the real Godzilla wakes up, and you know how he is the first thing in the morning! The spacemen then send Mechagodzilla to get rid of Godzilla! Those wacky spacemen! Don't they know that nothing can stop Godzilla!
A Prophetess forcasts doom and sees a monster coming to destroy Japan (there's that monster magnet again). now she must wake up King Ceasar a huge creature from the local mythology to help save them. The only thing that ruins this one is the fact that King Ceasar looks just like Barkley the Dog from Sesame Street. He can't fight either. I think Godzilla would have won just fine with out his interference.
This one belongs on your shelf so run out and get it now! This is my definition of "classic". It has everything... aliens, monsters, and tag team action. Everything a good Godzilla movie ought to have.