Once the spoiled brat son of the wicked Marine Captain Morgan at Shell Town, Helmeppo later joined his new friend Coby in the quest to become members of the Marines, eventually ending up under the leadership of Vice-Admiral Monkey D. Garp.
Originally the spoiled, bratty son of the iron-fisted Captain Morgan who was in charge of the Shell Town Marine stronghold, Helmeppo's life took a drastic turn from a life of lavish treatment into one of misery once his father gets crushed in combat against Monkey D. Luffy and Roronoa Zoro and loses his status with the Marines. Eventually befriending the young Coby, Helmeppo decides to join him on his quest to become a great Marine.
One Piece: Episode of Luffy - Adventure on Hand Island (OVA)
One Piece: Episode of Luffy - Adventure on Hand Island is an OVA special.