A figure from ancient folklore, the doppelganger—in fiction a character's sinister look-alike—continues to appear in literature, television and film. The modern-day version (of the Doppelganger, or "double-goer" in German) is typically depicted in a form adapted to reflect present-day social anxieties. Focusing on a broad range of narratives, the author explores 21st century representations in novels (such as Audrey Niffenegger's Her Fearful Symmetry , Jose Saramago's The Double ), television shows ( Orphan Black, Battlestar Galactica, Ringer ) and movies ( The Island, The Prestige, Oblivion ).