Game of Thrones will return for its eighth and final season on Sunday, April 14th, and folks who have never watched an episode or people who need a refresher have been binging the hit HBO series in an attempt to be ready for the final six episodes. But if you don’t have time to watch all 67 episodes before the final season, executive producer Bryan Cogman is here to help. The writer, who has been with the show since the first season, named 21 episodes that are a must-see before jumping into Season 8. For Cogman, these are …