King Arthur and the Knights of Justice was a kids animated TV show from 1992. It was about an American football team, the New York Knights, and their star quarterback Arthur King.
Each episode the team would go back in time (I forget how) and become the Kinghts of Justice. Each knight had a logo on his shield that would come to life as various weapons to use against the bad guys. I can't remember much else about it and only one other person I know can remember it! Does anyone else remember it?