With the new Godzilla movie promising a physical change in how Big G is depicted on screen, I was thinking about some of Godzilla's previous life-changes/
Poor Godzilla undergoes "the change" in 1994's Godzilla vs. SpaceGodzilla.
Toho had been producing a Godzilla movie every year since 1991, and during this time Big Green G had fought a cosmic-ray mutated rose/human/Godzilla hybrid (Godzilla vs. Biollante, 1989), a mecha-King Ghidorah (Godzilla vs. King Ghidorah, 1991), a dinosaur version of Mothra (Godzilla vs. Mothra, 1992), and Rodan and MechaGodzilla (Godzilla vs. Mechagodzilla II, 1993).
But Godzilla vs. SpaceGodzilla was a huge failure. Here, the idea is that some of Godzilla's and Biollante's spores left Earth with Mothra in 1992. They've since mutated into a Godzilla who sports giant crystals in his shoulders -- from which he can draw power from the sky and will destroy Earth.