MCU: Every Single Marvel Movie Post-Credits Scene Ranked Worst To Best
23. Black Panther - The White Wolf
After he was revealed to be in Wakanda seeking treatment to be freed from his Winter Soldier conditioning at the end of Captain America: Civil War, we don't actually see Bucky through the course of Black Panther.
He's clearly still in recovery somewhere, though the hints of how impressive the medical technology are in the country should have been a bit of a hint that he was fine all along. And then, right on the end of Black Panther, we get a post-credits scene confirming that Bucky is "reformed" and is now being referred to as White Wolf by local children as a symbolic gesture of his revival.
It's a pretty throwaway scene, all-in-all, but it does, importantly confirm that the Bucky in Infinity War will be his old self and that the Winter Soldier arc is now finished, so it does serve a purpose.