Lost, Fringe, Stranger Things, Game of Thrones, Jurassic Park Series (movies), Heroes, The Umbrella Academy, Once Upon A Time, The Strain and there are more but I can't remember them right now. All of the above shows had a great idea and storyline for the first few seasons but then the seasons got worse and worse. Writers, Directors and Producers never think their shows through to a interesting ending; they can only create an interesting beginning. Personally, they should make ever tv show from books that are written by great authors and there is an end book for the series or there are so many book in the series that one doesn't have to worry about running out of material. I like the Spanish novellas. They are usually based on books so there is a clear beginning and ending.