" beware of the man who speaks in legs... "

H. B. Mettaton was the royal scientist before Archo, responsible for creating the CORE. Mettaton's Followers relay different explanations as to what happened to Mettaton. One iteration says that he "fell into his creation," another says that "his experiments went wrong," and the last says that he "shattered across space and time." Characters such as the Riverblook and Mettaton's Followers hint at his existence.