S10E349: Luffy's Emergency Situation! The Ultimate Shadow's Destination!

After defeating Taralan and releasing his shadow soul from within, Brook explains to Robin and Franky the truth that the zombies of Thriller Bark are actually corpses animated by shadows taken by Gecko Moria from his victims via the power of his Shadow-Shadow Fruit. Meanwhile, Moria meets with the rest of the Mysterious Four (as well as the hidden Straw Hats in Kumacy) where he uses his powers to steal Luffy's shadow to use his Special Zombie.