"Counterpart" is a science fiction thriller series that premiered in 2017. Starring J.K. Simmons in dual roles, the show centers on a mild-mannered United Nations employee who discovers that his organization is hiding a portal to a parallel universe. As he becomes entangled in espionage and intrigue between the two worlds, he confronts alternate versions of himself and others, exploring themes of identity, choice, and destiny. Praised for its intelligent writing and Simmons' compelling performance, "Counterpart" concluded after two seasons in 2019.