You’re in for a treat. Gear Fourth isn’t just a power boost—it’s a complete transformation that changes Luffy’s appearance and fighting style. Here’s exactly when it happens and what to expect. Luffy first uses Gear Fourth in Episode 726: "Gear Fourth! The Bounce-Man."

Now stop reading and go watch it. You’ll know the moment when Luffy’s arm shrinks into his body, he blows into it like a balloon, and Doflamingo’s eyes go wide. That’s when the real fight begins. Enjoyed this? Check out our other One Piece episode guides: When does Gear Fifth debut? (Episode 1071—but that’s a whole other story.)

If you’re watching One Piece and eagerly waiting for Luffy to unveil his next big power-up, you’ve probably asked: Which episode does Luffy get Gear 4?