The Saucer Kaiju Organic Saucer (円盤生物 Enbam Sebutsu?), which is a living flying saucer or a monster who can turn into a saucer. Most appeared in Ultraman Leo. There they were summoned by Black Directive from Black Star, and many of them were some of the greatest foes Leo faced.
Saucer monsters appeared from episode forty onward, in the story arc "Terror of the Saucer Race Series".