Nico Robin joins the Straw Hats.
The English title is "Scent of Danger! The Seventh Member Is Nico Robin!"
The scenes with Pell are anime-exclusive.
Unlike the anime, after Robin joins the crew, it is shown that Luffy, Zoro, and Nami returned to their usual outfits in the manga.
This is the last episode of the Arabasta arc.