The last three episodes of Gintama made such a good arc. The show is mostly been comedic up till this point. Don't get me wrong these episodes definetly had their funnier moments, but the emtion and the action carried it.
This arcs main conflict is between Umi-Bouzu and Kagura and her relationship with the Odd-jobs/Gin-sama. Umi-Bouzu was an all-round great character and the development on all the characters this arc where good. Everyone got a moment to shine. It all culminated really nicely with the final moments of Umi and Gin talking.
The best part of this arc and this episode especially was the setting. It was really well made. We have a terminal skyscraper, a ship, airships ready to fire, and an alien to top it off. Really creative stuff and took advantage of Gintama's world.