I have racked my brain for a while now trying to remember the name of that cartoon and figures, as ever since I have seen the new Colorful Castle LEGO I have been thinking their was something very similar about them. Not only do I remember the cartoon (because I watched it growing up), I had a lot of the figures too (although not anymore). As I recall, they had nifty holograms in the center of their chests. Yet they never replaced my Castle LEGO (I have many, many sets from that era). It seems TLC at the very least were unknowingly influenced by these, which is sad. Because they are not real knights.
Life is good.