Episode Title:Rattleballs.Episode Description:Finn meets an old sword-fighting robot named Rattleballs (voiced by Rainn Wilson), and learns that Rattleballs was part of an elite force made by Bubblegum long ago to protect the Candy Kingdom; however, the group became too destructive and so they were all destroyed, save for Rattleballs. After a short skirmish, Rattleballs proves that he is not a threat, so Bubblegum relents and does not destroy him.