As part of our exploration of parallel worlds, Two Nerds discuss the spy thriller series Counterpart. J.K. Simmons plays a double role as Howard Silk, each of whom are members of a shadowy U.N. agency in two different versions of reality. One is a stupendous badass, and the other a colorless drone. The two versions of reality are in something of a cold war with one another, and the two U.N. agencies -- and the two Howard Silks -- are on a slow-moving collision course. It's such a good series.