One Piece episode 694

It aired on Sunday, 24 May 2015.

Invulnerable! The Terrifying Headcracker Doll Army

Robin, Rebecca, and Bartolomeo draw closer to the Flower Field on the forth level of the Royal Palace plateau, but a sudden attack by Gladius exploding spheres send Robin and Bartolomeo hurtling towards the level below, and directly into Luffy and the others' battle with the creepy Headcracker Dolls!