Gintama

The Gintama watch order threads together ten episode blocks — roughly 367 episodes — with one film slotted into the middle. Start with Episodes 1-49 and continue through the following 50- and 51-episode runs; after the fourth block, the Gintama Movie 1: Shinyaku Benizakura-hen retells and expands a key arc before you return to the TV episodes. From there, keep going through the later 51-, 13-, 12-, 13- and 26-episode seasons to reach the finale. Gintama's release history is famously fragmented across many titles, so watching in this chronological order is the reliable way to keep its arcs in sequence. If you want just the core story you can treat the Benizakura film as optional since the arc also appears in the series, but this is the complete correct order and shows exactly where to start and where the movie fits.