: Henzo recognizes the children as his old friends who disappeared into the mist over 50 years ago. Context & Viewing Advice
: While the episode is filler, the corresponding Manga Chapter 140 focuses on Chopper's backstory and his first meeting with Dr. Hiriluk. One Piece Episode 140
: Inside the mist, Luffy, Zoro, Usopp, Robin, and Professor Henzo arrive at a graveyard of wrecked pirate ships. : Henzo recognizes the children as his old