Jack-in-the-Box

Garp demands an apology from Luffy, and Nami recognizes him as a celebrated Marine. Luffy cautions the crew against provoking a grandfather who nearly killed him on countless occasions, which the old man waves off as nothing more than toughening him up. Garp says he had wanted the boy to grow into a strong Marine and pins the blame for that failure on Shanks, prompting Luffy to defend the man who once saved his life. When Garp grabs him, the pair unexpectedly nod off in the middle of arguing, and Garp, waking first, slugs Luffy for dozing despite having done the same.

Garp identifies Shanks as one of the Four Emperors, equals of Whitebeard, and describes the three forces that hold the world in balance: those Emperors, the Seven Warlords, and the Marines. Zoro stumbles in searching for the crew and is met by two young Marines who reveal themselves as Koby and Helmeppo, both transformed, Koby now wielding Soru. Repairing the wall he had smashed simply because it looked cool, Garp asks whether Luffy crossed paths with his father at Loguetown, then announces that the man is the revolutionary Dragon. The disclosure that Dragon fathered a son, and is himself Garp's son, rattles Marines and pirates alike, and Robin explains that the Revolutionaries are gathering strength to bring down the World Government. Garp sheepishly asks everyone to forget he ever brought it up.

More of Luffy's upbringing under Garp comes to light, including the grueling training meant to make him a Marine and the old man's resentment of Shanks. Koby and Helmeppo return as enlisted soldiers. The Four Emperors are introduced as rulers of the Grand Line's far half, with Shanks and Whitebeard named among them, and the Three Great Powers are defined. Dragon is confirmed as the man who sired Luffy and as Garp's own son, while Robin reveals he commands the Revolutionary Army and stands as the most wanted figure alive.