Godzilla ゴジラ (1990)

With the production of Godzilla vs. Biollante (1989) wrapping up, Toho's most iconic monster Godzilla was set to remain idle for a time, while the company began looking into other monsters to resurrect for the big screen - eventually deciding on Mothra. At this time, Tomoyuki Tanaka pitched the idea for a tetrology of films to take place in the universe first established with The Return of Godzilla (1984). The first of these films, Mothra vs. Bagan, would have taken place one year after the battle between Godzilla and Biollante, with Godzilla himself set to appear in an unspecified cameo role in the movie. This cameo would have alluded to the next movie in the tetrology, Godzilla 3, where the king of the monsters would have fully recovered from the ANEB and played a major role, while the history of Bagan would have been expanded upon. Tanaka's vision was to go in a new direction with the series, allowing for other monsters to shine while not centering on just Godzilla as the movies progressed.

Unfortunately, Tanaka's strategy would meet an unceremonious end as Godzilla vs. Biollante (1989) failed to meet expectations at the box office, giving Toho cold feet on continuing with a big budgeted Mothra movie and having them cancel Mothra vs. Bagan and Godzilla 3, the former having even garnered the approval of then-current Toho president Tanaka. Intent on continuing the series with Godzilla as the main star, Kazuki Omori was tasked with creating new movie drafts featuring the monster. One of these drafts, Mothra vs. Godzilla, would have pit Godzilla against the moth goddess in a long-awaited rematch.

Eventually, Toho would fall back on King Ghidorah to be Godzilla's next opponent, as the three-headed monster placed favorably in a "favorite monsters" theatrical poll held during the run of Godzilla vs. Biollante (1989), and the series would head in a very Godzilla-centric direction, with Godzilla growing in size and gaining new abilities over time.

• No known concept art for Godzilla (1990) exists. Above is an interpretation created by Toho Kingdom staff using recolored concept artwork of Godzilla from Godzilla vs. King Ghidorah (1991).
• As this version would have been a direct follow-up to the incarnation featured in Godzilla vs. Biollante (1989), it's highly likely Godzilla would have remained at 80 meters and kept the same design from the aforementioned movie, as opposed to growing to 100 meters and having its design modified as it did in Godzilla vs. King Ghidorah (1991).
• The mention of Godzilla (1990)'s potential cameo in Mothra vs. Bagan and eventual lead into Godzilla 3 can be found in the 1992 Japanese publication Encyclopedia of Godzilla - New Mothra Version (ASIN: B0084BST0U).