what episode does robin join the crew

Robin officially joins the Straw Hat Pirates crew at the end of the Arabasta Arc in the anime’s Episode 130 titled ‘Beware her Scent! Seventh One is Nico Robin’ based on chapter 218, ‘Why the Log Pose is Dome-Shaped’ of the One Piece manga. In this episode, Robin appears in the Straw Hat Pirates ship, the Going Merry, and claims she has nowhere else to go and is now Luffys responsibility since he forced her to live when she wanted to die. The others are shocked when Luffy lets her, a former enemy, join the crew without any suspicion.