Described as an espionage thriller with a metaphysical twist, "Counterpart" tells the story of Howard Silk (J.K. Simmons), a lowly cog in a bureaucratic UN agency who is turning the last corner of a life filled with regret, when he discovers the agency he works for is guarding a secret: a crossing to a parallel dimension. Through Howard and his "Counterpart" on the other side, Prime, the show will navigate themes of identity, idealism, what ifs, and lost love.