Reigon

Reigon レイゴン is an unmade manta ray from the unmade 1966 Nikkatsu film, Reigon: Devil of the Seabed.

Appearance
Reigon was a giant manta ray.

Reigon: Devil of the Seabed
Reigon, a giant manta ray, appears one day and wreaks havoc, and ends up having to fight a giant iguana.

Reigon and his unnamed giant iguana opponent were scrapped along with their film and replaced with Gappa, the Triphibian Monster.