Nincompoop Prison

Nincompoop Prison is an episode of the first season of The Grim Adventures of Billy and Mandy. It has aired on Cartoon Network on September 12, 2003.

Synopsis
When Billy gets arrested by a mysterious figure, Mandy and Grim try to break him out.

Voice cast

 * as the Grim Reaper
 * Richard Steven Horvitz as Billy
 * Grey DeLisle as Mandy
 * Diedrich Bader as Warden McDippster