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Episode 684
"Gathering into a Powerful Front! Luffy and a Group of Brutal Warriors"

Luffy and Law survived Pica's punch and then are found by many of the fighters from the Colosseum, who all thanked him because "God Usopp" saved them. They all fight over who will kill Doflamingo and then join up together to begin the fight against Pica.

Japan airdate: March 15, 2015