15 Things You Need To Know About Captain Britain to appreciate his role in the Marvel comics multiverse, and why a TV show based on his adventures is something that many fans are clamoring for.

https://screenrant.com/captain-britain-facts/

"...Whether saving the entire multiverse or just the British Isles, Captain Britain has a long legacy as a consistently popular superhero within the UK. While the character isn’t anywhere near as well-known as the far more famous Captain America, Brian Braddock has participated in plenty of amazing adventures and made a genuine contribution to the lore of the entire Marvel Universe...."