Robot Girls Z: Fukkatsu no Chika Teikoku!? Robot Girls Z vs. Nazo no Sandai Shuyaku Robo!
Japanese title: 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！」
Type: Special
Episodes: 1
Source: Original
Genres: Comedy
Studios: Directions
Duration: 11 min
Rating: PG-13 - Teens 13 or older

Petit animation included with the Robot Girls Z Full Complete Blu-ray.