- Keep Circulating the Tapes: The surviving episodes of the series can easily be found online.
- Missing Episode: Of this 26 episode series, only eight episodes are known to survive and even then as poor quality rips.
- What Could Have Been
- The show was originally planned as a live-action adaptation of Osamu Tezuka's manga Majin Garon.
- Three Devil Beasts are known to have been designed for the show but did not appear: Ancient Devil Beast Bamboss, Great Whirlwind Devil Beast Greeder and Typhoon Devil Beast Vibron.
- Working Title: The eponymous hero was first designed as "Green Man" before changing to Thunder Mask.
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