for years the have said that chuck was never talked abour after season 2 well I found out tonight that its not quite true one the internet archive there is the 1976 rebroadcast of guess whos coming for Christmas and at the very start there is a new scene with al and fonzie and fonzie tell al about richies brother chuck being home from colliage I had no idea that this even exsisted or maybe I just forgot since I did watch happy days back then anyway it was interesting

Yea I remember that show. I don't know if there are any more like that but they used to show that Christmas episode quite often around Christmas.