X-Demon was the strongest form of Demon Weegee back when he was in his Y-Demon form, he was hungry for power and transformed into X-Demon. Seconds away from destroying the Epic World planet, Weegee was revived by Soul Weegee to save the day and destroy X-Demon before the planet was in danger. He was given the Multi-Form Tool which can make him split into his previous forms with keeping his present form in existence.