Shipwreck survivors found on the presumably uninhabited Infant Island leads to a scientific expedition that discovers a surviving native population along with the Shobijin, tiny twin fairy priestesses of the island's mythical deity called Mothra. After the fairies are kidnapped by an exploitative businessman named Clark Nelson, Mothra sets out to rescue them.
Frankie Sakai
as Senichiro 'Sen-chan' Fukuda
Hiroshi Koizumi
as Dr. Shin'ichi Chûjô
Kyōko Kagawa
as Michi Hanamura
Jerry Itō
as Clark Nelson
Ken Uehara
as Dr. Harada
Emi Ito
as Shobijin (Twin Fairy)
Yumi Ito
as Shobijin (Twin Fairy)
Takashi Shimura
as News Editor
Akihiro Tayama
as Shinji Chûjô
Akihiko Hirata
as Doctor