The Showa Era
- Godzilla (1954) - Unchanged.
Godzilla Raids Again (1955) - Unchanged, except postpone the release date to November/December '55.
King Kong vs. Godzilla (1962) - Unchanged.
Mothra vs. Godzilla (1963) - Unchanged.
Ghidorah, the Three-Headed Monster (1964) - Two Mothra larvae instead of one.
Frankenstein vs. Godzilla (1965) - Godzilla would team up with Baragon to battle a giant Frankenstein Monster.
Operation Robinson Crusoe: King Kong vs. Ebirah (1966) - Unchanged.
Invasion of the Astro-Monster (1966) - Add Varan into the mix to fight alongside Godzilla & Rodan. Instead of Ghidorah, it's Dogora.
King Kong Escapes (1967) - Include Maguma as either an enemy or an ally.
Son of Godzilla (1967) - Have Ebirah & Gabara as the main antagonists and make Kumonga an ally. Include Maguma as well.
Godzilla vs. Redmoon (1968) - Maybe add in Anguirus and Kumonga as potential allies to Godzilla.
Godzilla vs. Hedorah (1969) - Godzilla doesn't fly, enough said.
The Return of King Ghidorah (1970) - Godzilla & Anguirus battle against Ghidorah & Megalon.
Godzilla vs. the Space Monsters: Earth Defence Directive (1971) - Godzilla, Anguirus, Rodan & Varan battle against King Ghidorah, Megalon, Gigan & Mogu.
Godzilla vs. Mechagodzilla (1972) - Bring Anguirus back for the climax.
Terror of Mechagodzilla (1973) - Mothra would return to help Godzilla.
All Monsters Attack Directive (1974) - Godzilla, Anguirus, Rodan, Varan, Mothra (Imago & two larvae), Maguma, Manda, Baragon, Sanda, Gorosaurus, Kumonga, Minilla, Kamoebas, Jet Jaguar & King Caesar battle against King Ghidorah, Moguera, Dogora, Gaira, Ebirah, Kamacuras, Gabara, Gezora, Ganimes, Redmoon, Hedorah, Gigan, Megalon, Mogu, Mechagodzilla & Titanosaurus.
The Heisei Era
- Godzilla (1984) - Unchanged.
Godzilla vs. Biollante (1989) - Unchanged.
Godzilla vs. King Ghidorah (1990) - Instead of three "dorats", Ghidorah starts out as a small egg.
Godzilla vs. Mechagodzilla (1991) - Godzilla & Rodan team up to battle Mechagodzilla.
Godzilla vs. Bagan (1992) - Godzilla teams up with Mothra & Battra to fight against Bagan & Gigamoth.
Godzilla vs. Astrogodzilla (1993)
Godzilla vs. Destoroyah (1994) - Godzilla would team with not only his son, but also Anguirus, Mothra, Battra & Rodan as well.
The Jan de Bont series
- Godzilla (1996) - Basically the same as his original vision.
Godzilla II (1999) - Godzilla would team up with Mothra to battle Ghidorah.
Godzilla III (2002) - Godzilla & Mothra, along with Anguirus & Rodan, battle against Moguera, Gigan, and ultimately, the same aliens that created Ghidorah and the Gryphon.
The Millenium series
- Godzilla Reborn (2004) - Godzilla would fight against Orga and Miba.
Godzilla vs. Megaguirus (2005) - Follow-up to Godzilla Reborn.
Godzilla Against Mechagodzilla (2006) - Follow-up to GvM.
Godzilla: Tokyo S.O.S. (2007) - Follow-up to GXG; Godzilla, Kiryu & Mothra have to team-up against Ghidorah, Gigan & Titanosaurus.
Godzilla X Varan, Baragon and Anguirus: Giant Monsters All-Out Attack (2008) - Basically the same as Kaneko's original vision.
Godzilla: Final Wars (2009) - Godzilla, Anguirus, Rodan, Varan, Mothra (Imago & two larvae), Maguma, Manda, Baragon, Sanda, Gorosaurus, Kumonga, Minilla, Kamoebas, Jet Jaguar, King Caesar, Battra & Kiryu battle against King Ghidorah, Moguera, Dogora, Gaira, Ebirah, Kamacuras, Gabara, Gezora, Ganimes, Redmoon, Hedorah, Gigan, Megalon, Mogu, Titanosaurus, Biollante, Destoroyah, Orga, Miba & Megaguirus.
The Gareth Edwards series
- Godzilla (2014) - See this video at 11:22: https://www.youtube.com/watch?v=2BoE9__99hs
Kong: Skull Island (2017) - Bring back Gorosaurus & Kumonga as allies, and Ebirah & Kamacuras as potential enemies.
Varan: Guardian of the Sky (2021-2023) - A reboot/reimagining of Varan the Unbelievable.
Godzilla vs. Varan (20??)