Penny Dreadful is one of the greatest and underrated TV Shows I've come across. The star cast, script, cinematograph, and the background score will leave you speechless. I've come across people who have seen a lot of mainstream TV Series but they don't know about this extravagantly brilliant TV Series yet. And I've seen over 60 TV Series and Penny Dreadful easily fits into my top 5 must watch TV Series, period.
