In Episode 554, titled "Great Clash! The Straw Hat Crew vs. 100,000 Enemies," Luffy showcases his immense power by immediately knocking out 50,000 Fish-Men with a single burst of Conqueror’s Haki. This pivotal scene highlights the Straw Hats' overwhelming strength upon their reunion to combat Hordy Jones' forces. You can stream this episode on platforms like One Piece Wiki or YouTube .
Watch the iconic moment where Luffy thins the enemy's numbers in seconds: [S5E54] Episode #5.54