You can the nuts and bolts of what became SHIN GODZILLA in this back to basics 1984 monster movie that set up the Heisei series of pictures. The human story revolves around whether the Russians and Americans will use nuclear weapons to contain the Godzilla threat at the cost of millions of Japanese lives. The Super X is actually a fun foil for Godzilla, a hard thing to manage in these single monster movies.
Good, but a little dry. They'd refine the formula over the next decade.