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A beast under the guise of a Flying Saucer travels from a distant planet to attack Earth. MAC doesn't detect it, and gets all but destroyed.
Tooru and some friends try to attract a flying saucer. Unwittingly, they draw the attention of Black Dome, which had been summoned to earth by Commander Black.
Another saucer, Absorba, has been summoned to earth. Gen suspects it is taking advantage of a boy's kind feelings towards animals.
The saucer monster Deemos has been called down to earth by Black Directive, and begins killing the inhabitants of Gen's town. What can the ultra do in this situation?