Fish-Man Island: The Fish-Man Island King, Neptune the Sea God!

Fish-Man Island: The Fish-Man Island King, Neptune the Sea God!

Available on Crunchyroll
S15 E14: After reuniting with Nami, Luffy and the gang are invited to the royal palace of Neptune, god of the sea; the New Fish-Man Pirates exploit the power of a designer steroid in order to terrorize humans.