One Piece (1999)

S01E40 Proud Warriors! Sanji and Usopp's Fierce Battles!

After Hatchan's defeat, two fishmen confront Sanji and Usopp. Sanji finds himself in a tough spot as he tries to take on Kuroobi beneath the waves, while Usopp seizes the opportunity to show that he can also be a courageous fighter.