Ultra Q
Due to the success of "Ultra Q", Tokyo Broadcasting System (TBS) wanted a new monster-themed show from Tokyo Broadcasting System, this time filmed in color. TBS hoped to create a continuing series with Tsuburaya Productions. Eiji Tsuburaya and writer Tetsuo Kinjo chose to take the barebones idea of "Ultra Q" about civilians and scientists dealing with monsters and have a group specifically created to deal with monsters and supernatural phenomena as the focus of the new show. The group was tentatively named the "Scientific Investigation Agency" (SIA). Tsuburaya and Kinjo decided to add unused ideas from "Ultra Q" and the rejected outline "Woo".