A Pinky and the Brain Halloween is an episode/TV special of Pinky and the Brain.
Plot[]
Mr. Itch (the devil himself) offers to give Brain the world in exchange for his soul; Brain refuses, but finds out later that Pinky has taken the deal. Snowball appears as his court jester, attempting to make Brain miss Pinky so much that he would look for him, leaving him in charge.
Brain enters a rhythmic gymnastics competition with Mr. Itch and loses, when Pinky points out that Mr. Itch was actually unable to fulfill his part of the deal, making the whole deal null and void.