As revealed in "The War for Dimension X" the Utroms were a peaceful race hailing from Dimension X. They seemed to be a species who prized intelligence and knowledge, but their era of peace came to an end when the Utrom scientist Kraang discovered a mutagenic substance derived from a local species of worm: The Kraathatrogon. With this mutagen, he transformed into a giant with incredible psychic abilities. With his new powers, Kraang conquered the Utrom and enslaved them all to his will; transforming them into psychic clones of himself and destroying their individual identities. Kraang renamed himself Kraang Prime and renamed the species after himself and used them to try and conquer Dimension X, and the greater universe as well.