Verokron is a missile Terrible-Monster created by Yapool that was from the TV series Ultraman Ace. Verokron was mentioned to be created by a combination of Space Monster and sea coral. It debuted in the first episode of the series, making it the very first Terrible-Monster which Ace fought. Alongside fellow antagonists Vakishim, Doragory, Ace Killer, Aribunta, Lunaticks and Baraba, Verokron is among the best known of Yapool's creations, and has made several reappearances over the course of the Ultraman Series.

Yapool's first Terrible-Monster to attack Earth, Verokron was unleashed upon the planet, attacking a power plant and a nearby suburb with his numerous array of weapons. Despite opposition from jets that opened fire on him, Verokron used his arsenal to obliterate them with ease. During his attack, Verokron killed two humans known as Seiji Hokuto and Yuko Minami, who were rescuing people during the attack. Impressed with their sacrifices, the Ultra Brothers sent their newest member, Ultraman Ace to merge with the two humans. In response to Verokron's attack on earth, TAC was formed to fight it and Minami and Hokuto were among them.