Challenge from Underground S21E21 - Challenge from Underground 2005
- Released: 2005-11-19
- Runtime: 50 minutes
- Genre:
- Stars: Nobuyuki Ogawa, Sean Nichols, Kai Shishido, Sota Aoyama, Hitomi Hasebe, Hikari Mitsushima, Kazuya Nakai, Susumu Kurobe, Hiroko Sakurai, Shirō Sano
- Director: Hiroaki Tochihara