Slight Spoilers
I am loving this series and has quickly become one of my favorites since I picked up 2199 in 2017. Disclaimer, I have not watched the original Yamato seasons and have only seen the modern rendition of the series.
After the events of 2202, Earth is recovering from its battle against Gatlantis and the planet Gamilas is dying. An unknown faction attacks Gamilas and the Cosmo Navy is hesitant to enter the conflict becuase its in a weakened state after 2202. This is where the story of 2205 begins. The events of 2199 and 2202 reverberate throughout the universe and plot threads from those seasons are further developed.
The first 4 episodes are a mixed bag for me. I found everything with Dessler and the story of Gamilas phenomenal. However, the Earth plot is much weaker as it's trying to introduce us to a handful of new characters. It's not bad, I just found the Gamilas story and politics amongst the different factions of the universe more interesting. Plus it was great to see Kodai continue to develop as a leader and captain of the Yamato.
However, for me just like the first 2 seasons, Yamato has a slow start and snowballs into something amazing. I find that to be the same case for 2205. Because episodes 5,6,7, and 8 were phenomenal. The action was fun and the reveals were great and felt earned. Dessler steals the show for this season and I will always welcome further development of his character.
This was another great season for one of my new favorites and I am more than excited for Rebel 3199.