If there is one rivalry that truly defines Lucha Underground, it is the beef between current Lucha Underground Champion Mil Muertes and the only man to defeat him so far, Fenix. The two faced off in a casket match in season one, and somehow managed to redefine that entire gimmick. It would be no stretch to say that it was the best casket match in history, and then some. The two came together when Catrina (the valet of Muertes) got involved with Fenix, which led to the young luchador defeating Muertes in the aforementioned casket match. It was as bloody and violent as such matches should be, and led to Muertes disappearing for a few weeks. When he returned he was a different beast altogether, and a much more terrifying one at that. Muertes got his revenge on Fenix in a death match, but the beef between the two is far from over. They are on a collision course once more, and part three in this rivalry can't come soon enough. The story is that Muertes is nigh-on unstoppable, but the one man with the ability to rise above him in victory is Fenix. The only doubt is whether the two will be able to top their two genre-defying battles from season one.