A two episode series that aired on the Toei Tokusatsu Fan Club streaming channel. Part 1 takes place before the end of Heisei. Part 2 airs after the Reiwa era has started.
- Great Leader Oogumo (大蜘蛛大首領)
- Gremlin (グレムリン)
- Ganma Speriol (眼魔スペリオル)
- Cancer Zodiarts (キャンサー・ゾディアーツ)
- Demushu Evolved (デェムシュ（進化体）)
- Grengura Fight Bugster (グレングラファイトバグスター)
- The opening is a parody of the Hongou Takeshi being modified to become Kamen Rider. The voice of Mu's leader says they want someone who has an IQ of 600. In his stats, Takeshi has an IQ of 600.
- Mu say they're named after the Japanese word for "nothing", but their symbol is the katakana for Mu/ム.
- Crystal Peppler is named after Chris Peppler, who voices Belt-san and portrays the professor who created the Roidmudes.