Luffy Gear 4 First Episode !!top!! File

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| Category | Detail | |----------|--------| | | Gear Fourth! The Bouncy Man of Boundman | | Original Airdate | August 2, 2015 | | Arc | Dressrosa | | Key Animation Directors | Yoshikazu Tomita, Naoki Tate | | Manga Chapters Adapted | 783 (final pages), 784 (first half) | | Run Time of Fight | Approx. 8 minutes (transformation + Kong Gun) |

The transformation takes place during the climactic battle against in the Dressrosa Arc. After seeing his Gear 2 and Gear 3 attacks fail to break Doflamingo’s defenses, Luffy realizes he needs a form that combines speed, power, and durability. How Gear 4 Works: The Science of "Muscle Balloon"

The first version of Gear 4 revealed is (or Bounceman): Gomu Gomu no Mi/Gear 4 Techniques - One Piece Wiki