oooooo... Good Question. Well the catch behind any good show is the ability to relate to the characters and if we are going by those standards than, logically, the introduction to a show would be the first episode. With that being said, and the fact that Dudes watching the show is highly... for the sake of reasoning, unorthodox, the best episode for an intro (in my opinion) is probably, If your more of a musical person then Magical Mystery Cure, for everyone else, I'd say Putting Your Hoof Down because it is a Great episode and it has plenty of outside references that non-Bronies could relate to.