Kaiteigagan is a super beast that appears in Ultraman A.
Appeared in episode 34, "The super beast dances on the rainbow of the sea." A super beast that lives 5,000 meters below the ocean floor in the Pacific Ocean. Its origin is unknown, but it is thought that either Yapool made it in advance, or the debris from Yapool's defeat became the sea's grudge. The Ultra Monster Encyclopedia explains that Yapool's fragments made the shell super-beast.