Gamera 3-D

Following the unfortunate abandonment of Godzilla 3-D in exchange for Legendary Pictures' Godzilla, Yoshimitsu Banno, the unmade film's producer, turned his eyes to a Gamera project. Banno repackaged the screenplay for Godzilla 3-D into Gamera 3D, featuring Gamera battling a pollution-based monster called "Gaira" (no relation to the Green Gargantua), which transforms into the more powerful Namagon. Gamera would then team up with the mythical creature Son Gokuu and defeat Namagon. Like Godzilla 3-D, this was intended to be a 40-minute short IMAX film to be produced by Banno's independent company Advanced Audiovisual Productions. This idea was discarded in favor of another film featuring Hedorah battling a green algae-based kaiju called Midora, on which Banno was still actively working at the time of his death on May 7, 2017 (aged 86)

Hedorah vs. Midora
"Godzilla vs Hedorah 2", "Godzilla 3D to the Max", "Jewelers" and "Gamera 3D" have all become unmade Kaiju film fact, that isn't stopping director Yoshimitsu Banno from trying a FIFTH time! His latest attempt will be "Hedorah vs Midora" where a brand new, heroic plant monster battles the evil smog monster.