Doppelgänger - Dublul

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Doppelgänger or "Fetch" is the ghostly double of a living person, a sinister form of bilocation.
In the vernacular, "Doppelgänger" has come to refer (as in German) to any double or look-alike of a person. The word is also used to describe the sensation of having glimpsed oneself in peripheral vision, in a position where there is no chance that it could have been a reflection. They are generally regarded as harbingers of bad luck. In some traditions, a doppelgänger seen by a person's friends or relatives portends illness or danger, while seeing one's own doppelgänger is an omen of death. In Norse mythology, a vardøger is a ghostly double who precedes a living person and is seen performing their actions in advance.

Doppelgängers, as dark doubles of individual identities, appear in a variety of fictional works from Fyodor Dostoyevsky's The Double to Season of Migration to the North to Ralph Ellison's Invisible Man. In its simplest incarnation, mistaken identity is a classic trope used in literature, from Twelfth Night to A Tale of Two Cities. But in these cases, the characters look similar for perfectly normal reasons, such as being siblings or simple coincidence.
Some stories offer supernatural explanations for doubles. These doppelgängers are typically, but not always, evil in some way. The double will often impersonate the victim and go about ruining them, for instance through committing crimes or insulting the victim's friends. Sometimes, the double even tries to kill the original. The torment is occasionally earned; for instance, in Edgar Allan Poe's short story William Wilson, the protagonist of questionable morality is dogged by his doppelgänger most tenaciously when his morals fail. When doppelgängers are used as harbingers of impending destruction, they are almost always supernaturally based. Some works of fantasy include shapeshifters, as either talented individuals or as a separate race, who can mimic any person.
In some myths, the doppelganger is a version of the Ankou, a personification of death; in a tradition of the Talmud, to meet himself means to meet God.
Another variant, usually seen in science fiction, involves clones, which creates a genetically identical new being without the memories and experiences of the original. Some futuristic variants in fiction duplicate living beings in their entirety, albeit sometimes with modified memories and motives.
Doubles are also seen in fiction involving time travel and parallel universes, as in the motion picture Back to the Future Part II. In this case, the doppelgänger really "is" the doubled person, but from a different timeline or different version of the universe.