Mad Jack

Mad Jack is a killer Jack-In-The-Box created by King K. Rool. He possess the ability to throw fireballs, shoot lasers and even turn invisible

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.