In many cultures, doppelgangers are seen as harbingers of misfortune or even death.

Robert Louis Stevenson's novella delves into the duality of human nature through the character of Dr. Jekyll and his evil alter ego, Mr. Hyde.

Simon James, played by Jesse Eisenberg, is the protagonist of the film who finds himself confronted by his doppelganger, James Simon.

Carl Jung's theory of the shadow self posits that doppelgangers embody the repressed and hidden aspects of an individual's personality.

Dorian Gray's doppelganger is a portrait that reflects his inner corruption and moral decay.

In 'Enemy', Jake Gyllenhaal plays a college professor who discovers his doppelganger, a history teacher with a completely different life.

In Scottish folklore, a 'fetch' is a doppelganger that appears as a ghostly double of a living person, often as a harbinger of death.

In 'The Great Gatsby', Jay Gatsby's doppelganger is Tom Buchanan, who represents Gatsby's dark side and ultimately leads to his downfall.

Robert Angier, played by Hugh Jackman, is the magician who creates a doppelganger of himself using a complex stage illusion.

The doppelgänger illusion is a psychological phenomenon in which a person feels like they are being watched or followed by an unseen presence, often associated with doppelgangers.

Victor Frankenstein is the creator of the monster, who becomes his doppelganger and ultimately leads to his downfall.

In 'The Sixth Day', Arnold Schwarzenegger plays Adam Gibson, a man who discovers that he has been cloned and replaced by his doppelganger.

In Jungian psychology, the shadow represents the repressed and hidden aspects of the personality, often associated with doppelgangers.

In 'The Picture of Dorian Gray', the portrait of Dorian Gray becomes a doppelganger that reflects his inner corruption and moral decay.

Anthony Clair is the doppelganger who haunts the protagonist, Adam Bell, and represents his dark side.