Ultra Kaiju (ウルトラ怪獣 Urutora Kaijū lit. Ultra Monster) is the term for the monsters that appeared in the Ultra Series. The monsters featured in this category includes both evil and good, villainous and benign, heroes and hostiles. This category is the base category for all the monsters in the Ultra Series, including Kaiju, Seijin, Choju, and imitation Ultras.

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