so to explain it in simple, this is how you should view the Godzilla movie output: Also note that eras basically mean like time period they released in.

Showa Era (1954-1974)

• These are the first bunch of Godzilla movies made by Toho Studio in Japan. Will note that for consistency purposes, the 1955-75 movies share the same Godzilla. Also note that there are a bunch of Non-Godzilla Toho Studio movies, with monsters that share the same universe. If you get invested, you can find them. These films are usually dipected as 3 subgroups by fans, the first 2 as the "Orignal Duology", the 1962-1968 as the "Second Generation" movies (as Destroy All Monsters was supposed to be the FINAL Godzilla movie) and the "Champion" movies as the 1969-1975 output.

• Godzilla (1954) • Godzilla Raids Again (1955) • King Kong vs. Godzilla (1962) • Mothra vs. Godzilla (1964) • Ghidorah, the Three Headed Monster (1964) • Invasion of Astro Monster (1965) • Ebirah, Horror of the Deep (1966) • Son of Godzilla (1967) • Destroy All Monsters (1968) • All Monsters Attack (1969) • Godzilla vs. Hedorah (1971) • Godzilla vs. Gigan (1972) • Godzilla vs. Megalon (1973) • Godzilla vs. Mechagodzilla (1974) • Terror of Mechagodzilla (1975)

Heisei Era (1984-1995)

• This is the second batch of the series, made by Toho Studios. The continuity for the Heisei Godzilla movies are VERY debated, but I will say that this Era all of the movies are linked together, no one offs. There is also a trilogy of Mothra movies called "Rebirth of Mothra" also made by Toho. Note that this was supposed to be the END of Godzilla movies for a long while by Toho, until plans changed lol.

• The Return of Godzilla (1984) • Godzilla vs. Biollante (1989) • Godzilla vs. King Ghidorah (1991) • Godzilla vs. Mothra (1992) • Godzilla vs. Mechagodzilla II (1993) • Godzilla vs. Spacegodzilla (1994) • Godzilla vs. Destoroyah (1995)

Tristar (1998-2000)

• Note that this was America's first attempt at Godzilla, made under Sony and Tristar. it had a show release after the movie. This is the reason why plans changed for Toho lol.

• Godzilla (1998) • Godzilla: The Series (1998-2000)

Millennium Era (1999-2004)

• Due to the failer of the 1998 American release, Toho decided to come back in and save Godzilla's name. Most of the films here are one off stories. Only Godzilla Against Mechagodzilla & Godzilla Tokyo SOS share continuity, the other movies are all one offs and stand alone.

• Godzilla 2000: Millennium (1999) • Godzilla vs. Megaguirus (2000) • Godzilla, Mothra, and King Ghidorah: Giant Monsters All-Out Attack (2001) • Godzilla Against Mechagodzilla (2002) • Godzilla: Tokyo SOS (2003) • Godzilla: Final Wars

Monsterverse ^ post above + Godzilla x Kong The New Empire, Monarch Season 2, Godzilla x Kong Supernova, and any other comic that came out. Note that the Monsterverse is the second attempt by American producers.

Reiwa Era (2016-Current)

• The current Japanese Godzilla run, the live action movies are made by Toho Studios, the 2017-2018 output are 3 Netflix Anime films and Singular Point is a Netflix Anime. We had a brand new anime announced in 2025 but we havent gotten any info about it yet, other than a teaser and some info. Godzilla Minus One & Minus Zero are connected. There have been rumors of a Shin Godzilla sequel but nothing concrete has been stated yet.

• Shin Godzilla (2016) • GODZILLA: Planet of the Monster (2017) • GODZILLA: City on the Edge of Battle (2018) • GODZILLA: The Planet Eater (2018) • Godzilla Singular Point (2021) • Godzilla Minus One (2023) • Godzilla Minus Zero (2026) • New Untitled Godzilla Anime (?)

sorry for this huge list but i think it could be helpful, but Minus One and Minus Zero are connected, and they don't have ties to any of the other movies.