In "War of the Villains", Brad purchased Mad Jack in an attempt to scare Sid Phillips. Mad Jack came up to Sid as a simple box, but then grew to a tremendous size. He then popped out and proceeded to terrorize Sid. He finished his job by simply waving Good-Bye.
Later on, Brad would later lead Mad Jack on an attack on Darla Dimple's Mansion. However, Darla had a few tricks up her sleeve, including a switch pulled by her bulter Max to electrcute and send Mad Jack falling to his doom.