Following the release of Godzilla vs. King Ghidorah (1991), work began on the next entry in the Godzilla Heisei "VS" series. A number of drafts featuring the monsters Godzilla, Mechani-Kong, and Gigamoth were penned, some of which included the adventures of microscopic protagonists exploring the inside of Godzilla's body, but ultimately a majority of these ideas went unused. Instead, one of these later entries - Godzilla vs. Gigamoth - inspired the idea to revive Mothra, after her initial 1990 debut film Mothra vs. Bagan was shelved in favor of a movie featuring King Ghidorah.
One of the earliest drafts for what would eventually become Godzilla vs. Mothra (1992) started off as a very simple edit of the Mothra vs. Bagan script: having all of the demon beast Bagan's parts replaced by Godzilla. This edit, created by writer Kazuki Omori near the end of 1991, was done only half-jokingly, as he wanted to see which parts would work best with Godzilla for the time being.
In the end, Godzilla would be given a new role in the movie instead, and while Mothra vs. Bagan still served as a major influence for the story for Godzilla vs. Mothra (1992), the part of Bagan would be handed over to Gigamoth, who in turn would later evolve into the monster Battra.