These connections need not be strictly continuity based: for example, the Moguera from The Mysterians is a different incarnation of the character than the one that eventually showed up in Godzilla vs. SpaceGodzilla, but because it's the same fictional concept, the connection is made. Also, the list includes one non-Toho film, Kong: Skull Island, because it has a direct story connection to the Legendary Godzilla films.
- Rodan (1956)
The Mysterians (1957)
Varan (1958)
Battle in Outer Space (1959)
Mothra (1961)
Gorath (1962)
Atragon (1963)
Dogora (1964)
Frankenstein vs. Baragon (1965)
The War of the Gargantuas (1966)
King Kong Escapes (1967)
Space Amoeba (1970)
The War in Space (1977)
Rebirth of Mothra (1996)
Rebirth of Mothra II (1997)
Rebirth of Mothra III (1998)
Kong: Skull Island (2017)