Finn tries to get an old gumball robot named Rattleballs to train him in the art of sword fighting. But Finn soon learns a secret about Rattleballs that will test his loyalty to Princess Bubblegum.
Finn tries to get an old gumball robot named Rattleballs to train him in the art of sword fighting. But Finn soon learns a secret about Rattleballs that will test his loyalty to Princess Bubblegum.
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