|First appearance:||Conker's Bad Fur Day|
|Character type:||Non-Playable Character|
Jack is a big metal box who asks for Conker's help when a larger female pink box is crushing him because of how Marvin is scaring her to death. He appears in the Barn Boys chapter of Conker's Bad Fur Day and Conker: Live & Reloaded.
In Conker's Bad Fur Day
Jack appears in the Barn Boys chapter in the area's first mission. Conker meets him and then Jack complains to him of the female box crushing him—he then asks Conker to help get rid of the "rodent" problem because it's what's causing the female box to crush Jack. He sends Conker off to meet his friend Burt, who helps Conker to open the gate leading to the cheese farm, Conker picks up roaming cheese pieces and gives them to Marvin; doing this enough times will cause him to explode. Jack rejoices as the female box gets off him, he then helps Conker by giving him a way onto the barn roof by allowing him to jump on him and the giant female box. On the roof is a wad of Cash and a switch that opens the doors to the barn.
- Jack seems to speak in a manner similar to the Looney Tunes character Foghorn Leghorn.
- If one were to listen to carefully as Marvin farts at him, Jack will say the following, "Holy cheese!" "I think you need to see a doctor."