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Rattleballs

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.
Aired: Jan 27, 2014 Genre: Animation Comedy Sci-Fi & FantasyCasts: Jeremy Shada John DiMaggio Tom Kenny Hynden Walch Olivia Olson Niki Yang Pendleton Ward Polly Lou LivingstonCreated By: Pendleton WardProducers:Duration: 11m Rating: 3.7 Country: United States of America, United Kingdom Production: Frederator Studios, Cartoon Network Studios