One Piece S04E79 - Retrieve the 5 Keys! The Straw Hat Crew vs CP9

The Straw Hats and Franky made it to the Tower of Justice. However, Fukurou reveals that one of the CP9 members has the key to Robin's handcuffs, and will not say which, so the Straw Hats must fight every member to find the key. Meanwhile, Chimney follows Spandam and Lucci down a secret corridor.