Need some opinions. I recently became aware of Warehouse 13 and I assume I will like it. I have all the season 4 episodes on my Tivo and the rest are available on Netflix. I really don't feel like watching 3 old seasons unless I really need to. So could I just start watching season 4, or will I miss a lot of back story?? If I need some back story, could I just watch SOME of the earlier stuff?