In the Out of Mind universe, X-Middle School was one of the first middle schools to be taken over by the Kids New Dictatorship. After their take over, Fillmore was given a spot on the corrupt Safety Patrol for his milk counterfieting.
Fillmore was set to appear in Out of Mind, siding with the Delightful Children when they come to liberate X - Middle School.
Before its discontinuation, Filmore was expected to take up the mantel of Sandman, after he starts having prophetic dreams the moment Sandman (OM)'s death.
Fillmore is set to appear in KND: Galactic Endgame.