The Kaiju Multiverse
From Wikizilla
The Kaiju Multiverse contains several distinct universes, each different from the other and ignoring most of the major events from the other universes. An exception is that all of the Godzilla universes include the original Godzilla film (or a variation of it).
Omniverse
There is only one Omniverse, which holds all other universes inside it.
Our own universe
The universe that we live in. In this universe, Godzilla, Gamera and all the other giant monsters are just figments of our imagination. It is possible that the movie All Monsters Attack lies in this universe.
Toho Multiverse
The Showa Godzilla universe
This is the first continuity. Starting with the original 1954 movie, it continues with Godzilla Raids Again, King Kong vs Godzilla, and so forth up until The Terror of Mecha Godzilla in 1975.
The Heisei Godzilla universe
This universe disregards every other Godzilla movie before it, except the original. It contains Godzilla 1985, Godzilla Vs. Biollante, Godzilla vs. King Ghidorah, Godzilla and Mothra: Battle for Earth, Godzilla vs Mechagodzilla II, Godzilla vs. Spacegodzilla, and Godzilla vs. Destroyah.
The Random House Youth Godzilla universe
The Random House Young Adult Godzilla universe
The TriStar Godzilla universe
Godzilla is a beast from Japanese mythology. When a kaiju like Godzilla attacks New York, they give him that name. This universe includes GODZILLA and Godzilla: the Series.
The Godzilla 2000 universe
This is the only, real stand alone universe in the Toho Multiverse. It references no other Godzilla events which means it could have none of them happen or it could have some of them happen or even all of them happen. It is known that Godzilla has been seen before though.
The Godzilla Vs. Megaguiris universe
The Godzilla from 1954 isn't killed by the oxygen destroyer since it wasn't invented. This same Godzilla still lives today. Godzilla is also able to avoid getting sucked into a small blackhole.
The GMK universe
The 1954 Godzilla film and the American Godzilla film exists in this universe.[This was a jab by the Toho Producers.]
The Kiryu Saga universe
The skeleton of Godzilla didn't dissolve and instead was left preserved underwater.
The Final Wars universe
In this universe, Xillians are different than their Showa versions. Either Godzilla is stronger than normal or every other kaiju is weaker in this universe. It is unknown what other movies take place in this universe, but it can be assumed, by considering Captain Gordon's age, that Godzilla was frozen in ice sometime in the 1970's.
Daiei Multiverse
This Multiverse holds all of the Daiei related series
The Showa Gamera universe
The Heisei Gamera universe
The Millenium Gamera universe
The Daimajin universe
Ultra Multiverse
This Multiverse holds all of the Ultraman continuities
The Ultra Q universe
The universe that holds the Ultra Q continuity
The Ultraman universe
The universe in which most of the Ultraman series are held.
