Episode 342

"Mystery of the Zombies! Hogback's Nightmarish Research Laboratory" is the 342nd episode of the One Piece anime.

Short Summary
Escaping from the Surprise Zombies of the mansion, Nami, Chopper and Usopp discover the truth about Cindry's identity and Dr. Hogback's experiments before being approached by a mysterious samurai zombie with Brook's voice. Meanwhile, Luffy's group are ambushed by ghosts who make them become depressed and destroy a platoon of outside zombies with a group team attack.