Episode 277

"Tragedy of Ohara! Fear of Buster Call!" is the 277th episode of the One Piece anime, and takes place during the Enies Lobby arc.

Short Summary
Clover reveals that the Poneglyphs were most likely carved by an ancient country in order to prevent their enemy, the World Government, from completely erasing their history, but is shot by Spandine, who then activates the Golden Den Den Mushi. Robin recognizes Olvia as her mother, but Olvia denies it, causing Robin to admit that she is an archaeologist and can read the Poneglyphs. The Buster Call commences, and, after a tearful reunion with her daughter, Olvia entrusts Saul with Robin's care.