Thread:Coolot1/@comment-4327179-20200518140137/@comment-4327179-20200611150439

And here's some info I learned about the development of each of the Heisei films starting with The Return of Godzilla aka Godzilla 1985:

After the box office failure of Terror of Mechagodzilla, Toho attempted to reinvigorate the franchise several times during the late 1970s and early 1980s. The first attempt was the announcement of a color remake of the original 1954 film entitled The Rebirth of Godzilla in 1977, but the project was shelved. A year later, it was announced that Toho would develop a film jointly with UPA studios entitled Godzilla vs. the Devil, though this, along with UPA producer Henry G. Saperstein's proposed Godzilla vs. Gargantua, also never materialized.

Godzilla series creator Tomoyuki Tanaka took charge of reviving the franchise in 1979, Godzilla's 25th anniversary, intending to return the series to its dark, anti-nuclear roots in the wake of the Three Mile Island accident. Hoping to win back adult audiences alienated by the fantastical approach to Godzilla films taken during the 1970s, Tanaka was further encouraged in his vision by the contemporary success of adult-oriented horror and science fiction movies like King Kong, Invasion of the Body Snatchers, Alien and The Thing. A draft story entitled The Resurrection of Godzilla was submitted by Akira Murao in 1980, and had Godzilla pitted against a shape-shifting monster called Bakan in the backdrop of an illegal nuclear waste disposal site, though the project was cancelled due to budgetary concerns. In 1983, American director Steve Miner proposed directing a Godzilla film at his own expense. Toho approved of the project, and Miner hired Fred Dekker to write the screenplay and paleosculptor Steve Czerkas to redesign the monster. The project was however hampered by Miner's insistence on using prohibitively costly stop-motion animation and shooting the film in 3D, and was thus rejected by major American movie studios. Under pressure from a 10,000-member group of Japanese Godzilla fans calling themselves the "Godzilla Resurrection Committee", Tanaka decided to helm a Japanese film for "strictly domestic consumption" to be released jointly alongside Miner's movie.

In an effort to disavow Godzilla's increasingly heroic and anthropomorphic depiction in previous films, Tanaka insisted on making a direct sequel to the original 1954 movie. He hired screenwriter Shuichi Nagahara, who wrote a screenplay combining elements of the previously cancelled The Resurrection of Godzilla and Miner's still unproduced film, including an intensification of hostilities during the Cold War and a flying fortress which fires missiles into Godzilla's mouth. Koji Hashimoto was hired as director after Ishirō Honda declined the offer, as he was assisting Akira Kurosawa with Kagemusha and Ran, and felt that the franchise should have been discontinued after the death of Eiji Tsuburaya.

Composer Akira Ifukube was offered to score the film but respectfully declined. At the time, it was rumored that Ifukube refused to participate in the film due to the changes made to Godzilla, stating, "I do not write music for 80-meter monsters". However, this quote was later clarified, by Ifukube's biographer Erik Homenick and Japanese Giants editor Ed Godziszewski, as a joke spread by fans which was later misinterpreted as fact. Ifukube declined to score the film due to his priorities, at the time, teaching composition at the Tokyo College of Music.