Episode 498

"Apprentice Luffy!? The Man who Fought the Pirate King!" is the 498th episode of the One Piece anime.

Long Summary
Ace, Sabo, and Luffy chase down a Danpa and succeeds to catch it, but a tiger steals it. To get revenge, the three brothers put fish on their back to lure the tiger, but a bear that can match the tiger appears. Ace attacks the bear, but it gets angry and chases the three brothers. It is then stopped by a former pirate captain named Naguri using Haki.

Sabo reveals that Ace is related to Pirate King Gol D. Roger. Luffy asks Ace about Roger, but Ace doesn't like his father being mentioned so Sabo and Luffy, and the three say they will break their relationship as "brothers". Meanwhile, Sabo's father goes to Bluejam and tells him that he wants Sabo back. The episode ends as Dadan discusses the visit of a certain world noble with Dogra and Magra.

Anime and Manga Differences

 * In the manga, it was never explained how Luffy found out that Ace was Roger's son or if whether or not Sabo was aware of said fact, however this filler episode shows that Sabo was fully aware of this fact and that he was the one who informed Luffy of it.
 * Naguri, an anime-only character, is introduced. He uses Haki to force a bear to retreat and he mentions that he fought Gol D. Roger when he was a pirate captain.