The film's title sequence shows a burning cross which transitions into the "me" character of Gamera's Japanese name. This complements the film's other biblical allusion, a passage from Mark 5:9 which is quoted as the basis for the Legion's name.
Made it onto Kinema Junpo's best Japanese films of the year list.
The Mother Legion was played by veteran suit actor Mizuho Yoshida, who also portrayed Godzilla in "Godzilla, Mothra & King Ghidorah: Giant Monsters All-Out Attack" and later Zedus in "Gamera the brave".
When creating the Legion suit Special Effects director Shinji Higuchi want to design it in such a way that wires would not be required to operate it. His solution was to fit two actors inside of the suit, who would have control of monster's movement and various extremities.
The Legion Plant was inspired by the Mammoth Flower from the original Ultra Q series.