Godzilla vs. King Ghidorah (1991)

The eighteenth film kept the Heisei era continuity going but with a radically different approach. The series has always had a level of science fiction within it, but GvK is straight-up sci-fi with a UFO and futuristic tech. Furthermore, while we've always known what Godzilla represents, the script attempts to explain what Godzilla actually is, making it a kind of origin story.
The end result is a clash of styles that's certainly unique. There's no denying that it has a lot of plot to offer a viewer, and a ton of explosive action, too, but I'm just not convinced that any of it was really a good idea.
The silver linings are that it saw the return of Akira Ifukube on score duties, and the model cities are top-notch.

2½ times a-changin' out of 5

Godzilla vs. Biollante (1989)

The seventeenth film is a direct sequel to the previous one, The Return of Godzilla (1984). It begins with a group scouring the wreckage of the city for a plot device, which is promptly put to use in more than one way.
It has the same dark tone but holds the attention in a different manner.
I can't go into detail here, but it's fascinating to me that Godzilla exists because we split the atom, whereas, in contrast, Biolante exists because two things are fused. There's more to the relationship than that. To Biolante, too; the creature is one of the most bizarre the series has ever birthed. It's also one of the most memorable. The final fight between the two giants is quite possibly the best action scene in any of the films so far! It's outstanding.
Oh, and tentacles without CGI? You betcha! That's how it should be done.

3½ alarms triggered out of 5