Thomas Wlaschiha (born 1973) is a German actor. Internationally, he is known for his roles as Jaqen H'ghar in the second, fifth and sixth seasons of the TV series Game of Thrones, as well as Sebastian Berger in the police procedural Crossing Lines. He also appeared in four episodes of Jack Ryan as Max Schenkel. He plays Dmitri Antonov / "Enzo" in the fourth season of Stranger Things. (Via Wikipedia)