Vakishim is a Terrible-Monster created by Yapool from the television series, Ultraman Ace. Created with the Terrible-Monster Creating Machine through the combination of a space monster and a caterpillar, the first Vakishim was simply one of Yapool's disguises, though subsequent examples appeared separate from, or together with their master in later installments of the Ultraman Series.

Yapool as Vakishim decided to take matters on his own to attack Earth, first by menacing Minami. While she managed to survive, Vakishim shot down a passing JAL Boeing 747 and disappeared. Vakishim managed to impersonate a small boy and used him as a puppet to hide from TAC. As the boy, he set his grandparents' and his home village on fire in a brutal display. Once TAC found out about the truth, Vakishim transformed into his true form and fled through his dimensional portal. Vakishim reappeared out from a different portal near TAC's HQ and proceeded to attack, with TAC's fighter jets' attacks doing nothing to the Terrible-Monster. Finally, Ultraman Ace arrived to do battle and after a brutal fight.