The Panther King was slated to be a major antagonist in the cancelled video game sequel Conker's Other Bad Day. He would have made a deal with Gregg the Grim Reaper to execute Conker the Squirrel and reclaim his throne.
Sometime after his demise in Conker's Bad Fur Day, the Panther King met Gregg the Grim Reaper and struck him a deal that can restore the panther to life in exchange for Conker's death. Gregg discovered a secret clause that clearly states a squirrel can die from beheading if decreed by a state execution. With this knowledge, the Panther King hires Don Weaso to steal from the royal treasury in a attempt to frame Conker for treason. However Conker discovered what Don Weaso was up to and ends up killing him at the federal reserve bank, which results in the squirrel's execution anyway for committing murder.
Once Conker is beheaded for his crimes, the Panther King returned to life as a doppelgänger of Conker in order to reclaim his throne. But first he had to clear the charge of treason against the squirrel by recovering the cash Don Weaso stole. The player would have controlled the Panther King as Conker for a portion of the game; gathering money in levels parodying various films and meeting characters both new and from the previous game. Eventually the Panther King collected all the stolen cash to clear Conker's name and retake the throne, before also killing a number of Conker's friends that knew about his deceptive plot.
Meanwhile, the real Conker wakes up inside a thumping nightclub called The Basement where he learns about what transpired after his death and now must return to the land of the living to dethrone the Panther King once again. The Panther King tries to stop Conker but is defeated and sentenced to be imprisoned within the deepest, darkest cell of the prison tower. However the Panther King would reappear once more to assist Conker in defeating the game's secret antagonist Berri. Afterwards, the Panther King would become emperor of the known universe.
Developer Rare Ltd originally planned to release Conker's Other Bad Day on the Nintendo GameCube as a sequel to Conker's Bad Fur Day. The game did not get very far into development, with much of the attention focused on making concepts and sketches. Microsoft eventually bought Rare Ltd and expressed no interest in continuing the game's development, cancelling the project.