Dai Kaiju (Japanese for 'Great' or 'Giant' Monster) is a general term used interchangeably to describe giant monsters, or Kaiju. In the Ultra Series, the term generally refers to monsters that are much larger than the Ultras they fight. The shortest Dai Kaiju is Gatanothor, whose height is roughly one and a half times greater than Ultraman Tiga's height. The longest one is held by Zoruim, which length was never proven due to his full size never being shown on screen. The largest Dai Kaiju by volume is Vacuumon, as its size is infinite, while the tallest is King Myra, whose height will continue to increase unless he is killed.

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