Godzilla dukes it out with a space ship. Really that's it - no aliens, just a space ship. Godzilla slaps it around with his tail and such. Nobody gets hurt very badly.
Yeah there's a kid in the movie and I think maybe one badguy falls down so this is definitely child-safe Godzilla-lite. I'd advise you to select one of Mr Zilla's many other fine films for your viewing fascination. There is a nice reveal scene when the big guy shows up, and we get to actually hear the line "look out, it's Godzilla!", but that still leaves a 98 minute pleasure deficit.
Odd how there's almost no plot exposition whatsoever, almost like it's part two of some other movie. There's no big re-awakening of Godzilla; he's just sort of in the neighborhood I guess and decides to knock down a couple buildings to meet his quota. And apparently a strange meteor has fallen into the ocean sometime before the movie opens - the sort of dramatic event normally found in a movie proper so we're not left saying "Meteor? I guess there was a meteor".
And after fifty years of incessant Godzilla attacks I have to wonder why the Japanese still bother to call in the army every time. What, this time tanks are going to blow him up? Godzilla should do a bit the next time they try it, like clutch his heart and do a big fake stage death. "Oh no not a bazooka! They got me!".