The story begins with three Aliens in human form preparing for a ritual to feed the Fog Mother's "siblings". The Fog Mother last came to earth during the Prehistoric Age and is the cause of the extinction of the dinosaurs. Kenji and his kid sister are in the mountains, investigating all the deaths of animals and trees there. The Fog Mother sends the three aliens, "Gorai", "Zuu", and "Agito" to kidnap Kenji's baby sister for the sacrifice.
Yuuta Mochizuki
Kouji Segawa · Kamen Rider J
Yuka Nomura
Kana Kimura
Kyoji Kamui
Cobra Otoko Garai
Yōko Mari
Hachi Onna Zuu
Satoshi Kurihara
Tokage Otoko Agito
Maho Maruyama
Fog Mother (voice)
Shozo Iizuka
Narrator (voice) / Earth Dwellers
Rikako Aikawa
Berry (voice)
