While most of the crew is still suffering from amnesia, Roronoa Zoro remains under the influence of a mysterious boy named Noko. Noko manipulates Zoro into attacking his own captain, Monkey D. Luffy.
The episode is part of the Italian dub broadcast, often titled "Zoro mette a nudo le zanne!" or similar variations depending on the network. OnePiece_Ep_223_ITA.mp4
Note: While this "X" scar resembles Luffy's permanent post-timeskip scar, this specific injury is (filler) and is not how he received his permanent scar in the original manga. While most of the crew is still suffering
Luffy is forced to engage in a high-stakes duel with Zoro to stop him. During the fight, Zoro uses a powerful three-sword style move that leaves a large "X" shaped cut on Luffy's chest. The episode is part of the Italian dub
For more detailed episode breakdowns, you can visit the One Piece Wiki or the IMDb page for this specific episode. Episode 223 | One Piece Wiki | Fandom
Monkey D. Luffy, Roronoa Zoro, Nami, Nico Robin, Sanji, Tony Tony Chopper, Usopp, and the Seahorse (Tatsu).