I will get the ball rolling with sharing the first link to good HFY themed content. The below is a story narrated in youtube videos with really good graphics (Created using the game Stellaris)

Stellaris Invicta 1 - Greater Terran Union

In 2200, mankind has journeyed to the stars to seek vengeance on their old enemy and extend their power across the galaxy.

1. Prologue
2. Part 1
3. Part 2
4. Part 3
5. Part 4
6. Part 5
7. Part 6
8. Part 7
9. Part 8
10. Part 9
11. Epilogue