The Prisoner Zombie is an enemy that appears in the first world of the campaign in the level Prison.
It will shamble towards you, getting caught in dead ends and being delayed by almost all obstacles. As such, it has very low maneuverability.
It is a zombie wearing an orange prison jumpsuit with blood on its face and yellow eyes. It also has some kind of a white collar on its neck. This is most likely a white undershirt that the zombie wore under his orange prison suit in prison before they were infected.