Ultra Q
Pre-production and story layout for the show began in December 1965 as "Bemler: Scientific Investigation Agency". Masahiro Yamada completed a sample teleplay titled "The Birth of Bemler" that featured an unused scenario originally written for "Ultra Q". TBS producer Takashi Kakoi demanded to have Bemler be easily differentiated from other similarly designed monsters to avoid confusion. Tsuburaya and Kinjo then decided to make Bemler more humanoid in design. Kakoi later requested that Bemler have a more metallic-based image.