Before we dive into the watch guides, it is crucial to understand what you are getting into. The Marineford Arc spans the aftermath of the Amazon Lily and Impel Down arcs. After failing to save his brother, Portgas D. Ace, from the depths of the world's greatest prison, Monkey D. Luffy recovers just in time to crash the execution at Marine Headquarters.
The arc spans from Episode 457 to Episode 489. However, note that episodes 457 and 458 are special retrospectives that look back on Ace's history, setting the stage for the war to come. The main conflict begins in earnest with Episode 459.
Here is the complete list of episodes that make up this unforgettable story.