On this episode, Saitama fights against the invaders' leader for the final battle. Meanwhile, the other heroes continue to fight on the ground.
So the battle finale was pretty epic just like in the manga and that's fantastic. Also it was nice to see how the producers closed the ending and kinda left it open for a possible next season. Other than that, I really hope the studio (Madhouse) can make a second season even though they're usually known for not making second seasons for their anime. Now if there is going to be a second season, what will happen next? Overall, a fantastic battle finale and season ending.
Conclusion: A fantastic battle finale and plot ending.