Millennials are getting quite the gift with the current Josh Hartnett renaissance ... and the actor's blond locks and brown beard are a far departure from his wholesome boy-next-door turned ...

The show is based upon the lurid horror fiction popular in the Victorian era. And Josh Hartnett looked the epitome of a 19th Century gent as he shot the upcoming second series of Penny Dreadful.

From the producer behind 'John Wick,' 'Fight or Flight' sounds like another pitch perfect, no-nonsense action flick.