The Robot Girls Z trio, aka Team Z, is a unit assigned to promote the future energy source Photon Energy, as well as eliminate any enemies who seek to take Photon Energy for themselves. The team's members are Z-chan, Gre-chan, and Grenda-san. Usually, the team operates from the Nerima Ward Oizumi Academy's Photon Energy District, in Tokyo.

Note: The main characters are reimagined versions of well-known previous ones, in girl form: Z-chan of Mazinger Z; Gre-chan of Great Mazinger; and Grenda-san of UFO Robo Grendizer.

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Other: Mazinger Z
Other: Mazinger Z Tai Ankoku Daishougun
Other: Getter Robo
Other: Great Mazinger
Other: UFO Robo Grendizer
Other: Daikuu Maryuu Gaiking
Other: Magnerobo Ga-Keen
Other: Koutetsu Jeeg
Other: Wakusei Robo Danguard Ace
Other: Choujin Sentai Barattack
Same setting: Toei Robot Girls
Sequel: Robot Girls Z Plus
Other: Robot Girls Neo