Here's my research on the live-action Godzilla franchise. Suggestions, changes, explanations, commentary welcome. I'll change the list according to your remarks.
Godzilla
Shōwa era
1. Godzilla (1954)*
2. Godzilla Raids Again (aka "Gigantis the Fire Monster," 1955)
3. King Kong vs. Godzilla (1962)*
4. Mothra vs. Godzilla (aka "Godzilla vs. The Thing," 1964)*
5. Ghidorah, the Three-Headed Monster (1964)*
6. Invasion of the Astro-Monster (aka "Monster Zero," 1965)*
7. Ebirah, Horror of the Deep (aka "Godzilla vs. the Sea Monster," 1966)
8. Son of Godzilla (1967)
9. Destroy All Monsters (1968)*
10. All Monsters Attack (aka "Godzilla's Revenge," 1969)
11. Godzilla vs. Hedorah (aka "Godzilla vs. The Smog Monster," 1971)
12. Godzilla vs. Gigan (aka "Godzilla on Monster Island," 1972)
13. Godzilla vs. Megalon (1973)
14. Godzilla vs. Mechagodzilla (aka "Godzilla vs. The Bionic Monster," 1974)
15. Terror of Mechagodzilla (aka "The Terror of Godzilla," 1975)
Heisei era
16. The Return of Godzilla (1984)
17. Godzilla vs. Biollante (1989)
18. Godzilla vs. King Ghidorah (1991)
19. Godzilla vs. Mothra (aka "Godzilla and Mothra: The Battle for Earth," 1992)*
20. Godzilla vs. Mechagodzilla II (1993)
21. Godzilla vs. SpaceGodzilla (1994)
22. Godzilla vs. Destoroyah (1995)
Sony (American)
23. Godzilla (1998)
Millennium era
24. Godzilla 2000: Millennium (1999)*
25. Godzilla vs. Megaguirus (2000)
26. Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001)*
27. Godzilla Against Mechagodzilla (2002)
28. Godzilla: Tokyo S.O.S. (2003)
29. Godzilla: Final Wars (2004)*
Reiwa era
30. Shin Godzilla (2016)*
Legendary (American)
31. Godzilla (2014)
32. Godzilla: King of the Monsters (2019)*
33. Godzilla vs. Kong (2021)
*Recommended by Baron Bizarre
GAMERA
Shōwa era
1. Gamera the Giant Monster (1965)
2. Gamera vs. Barugon (1966)
3. Gamera vs. Gyaos (1967)
4. Gamera vs. Viras (1968)
5. Gamera vs. Guiron (1969)
6. Gamera vs. Jiger (1970)
7. Gamera vs. Zigra (1971)
8. Gamera Super Monster (1980)
Heisei era
9. Gamera Guardian of the Universe (1995)
10. Gamera 2: Attack of Legion (1996)
11. Gamera 3: Revenge of Iris (1999)
Millennium era
12. Gamera the Brave (2006)
Tags:
Atragon (1963), for one.
The Baron said:
How many did I miss?
Technically, Mothra vs. Godzilla established that Mothra and Godzilla existed in the same universe.
JD DeLuzio said:
RE: shared universe in the Toho kaiju films:
Varan the Unbelievable introduces Modern Mysteries, the in-universe show that reappears in Ghidorah, the Three-Headed Monster, the film (as far as I can tell) that establishes the fact of a shared universe for most of the Toho kaiju films. I don't think that, before that, we had any indication that the various monsters co-existed. Even the outsize Frankenstein movies get folded in through Baragon's appearance in Destroy All Monsters, and I'm sure some other connections may have been made by the post-Showa era films, but I am mostly unfamiliar with those.
A few of these (Yog/Space Amoeba, for example) have no established connection to the others, so far as I can determine, save for the studio and the house style.
Oh, and the Green Gargantua and Kamebas from Yog got brief mentions in the Millennium Godzilla movies.
Gamera added!
You should add "& Gamera" to the subject line for ease of future reference.
(Thinking ahead; just a suggestion.)
Yes, yes, good thinking (he says, nodding sagely over a candle, looking incredibly evil)
Jeff of Earth-J said:
You should add "& Gamera" to the subject line for ease of future reference.
(Thinking ahead; just a suggestion.)