Finn practices his sword fighting skills at the candy junkyard, where he meets an old gumball robot named Rattleballs. To Finn's shock, he finds out he's not the master swordsman he thinks he is. What the what?! Finn begs Rattleballs to train him, but he soon discovers his mentor's deep, dark secret... a secret that will ultimately test Finn's loyalty to Princess Bubblegum.
Elenco: Jeremy Shada , John DiMaggio , Tom Kenny , Olivia Olson , Dee Bradley Baker , Hynden Walch , Pendleton Ward , Niki Yang , Steve Little , Polly Lou Livingston , Jessica DiCicco , Niki Yang , Maria Bamford .