“Thundermask” is another TV tokusatsu series I remember I watched as a kid while it aired from 1972 to 1973 with 26 episodes, and it is the giant hero’s name featured in the series.
It was coproduced by Toyo Agency and Hiromi Production and the serial manga version was drawn by Osamu Tezuka, but it is not that Tezuka authorized Thundermask as it was just made into the manga by him.
While it seems that this tokusatsu product was planned by Mushi Production that Osamu Tezuka (author of “Astro Boy Atom”) founded as a TV tokusatsu series featuring “Majin Garon” authored by Tezuka, it came to a halt (Mushi Production folded afterwards in 1973).
It looks like some of the former Mushi Production employees formed Hiromi Production and took over the plan as another tokusatsu show featuring a new hero.
It is said that Tohl Narita was called in to have him design the new hero but was picked out to get him to join the production of “Totsugeki! Human!!” and he left the project at the outset.
It is explained that they brought the new hero into being based on the draft drawn by Tohl Narita (as “Greenman”) was redesigned into Thundermask by a manga artist and designer Makiho Narita who belonged to Hiromi Production (no blood relationship to each other although their family names are the same Narita).
While it is unknown how much the design by Narita was incorporated into the hero in the end, if Thundermask was fully designed by Tohl Narita, two tokusatsu heroes designed by him, Human and Thundermask, could have showed up in front of us.