Hands down it has to be Fringe, amazing cast, great premise and manages to transition from monster of the week - a la X Files - to a fully immersive story that is action packed and tugs at your heartstrings. I'm not sure what platform it's available on these days, but I'm sure you can sail the high seas if need be.

Oh, and it's 5 seasons that actually has an ending, unlike many shows on streaming these days!