Also known as
- Romaji
- Robot Girls Z: Fukkatsu no Chika Teikoku!? Robot Girls Z vs. Nazo no Sandai Shuyaku Robo!
- Japanese
- ロボットガールズＺ「復活の地下帝国！？ロボットガールズＺ ｖｓ なぞの三大主役ロボ！」
- Synonyms
- Robot Girls Z Petit Chara AnimeRobot Girls Z+ SpecialRobot Girls Z: Fukkatsu no Chika Teikoku!?Robot Girls Z: The Resurrected Underground Empire!? Robot Girls Z vs. the Three Mysterious Major Lead-Role Robots!Robot Girls Z: The Resurrection of The Underground Empire!? Robot Girls Z vs. The Three Mysterious Leading Role Robots!