V'Ger is the transformed Voyager probe in Star Trek: The Motion Picture.
The film reveals that the immense entity threatening Earth began as Voyager 6, a fictional NASA probe launched from Earth. After traveling through space, the probe encountered powerful machine beings that upgraded it and returned it with vast knowledge.
Because its original designation had been altered and its purpose was misunderstood, the probe’s name appears as “V'Ger” in the film. It seeks its creator and interprets organic life as an obstacle to its mission, creating the central mystery of the story.
V'Ger is often confused with the film’s mysterious cloud because the entity is hidden within that visual phenomenon. The cloud is its outer manifestation, while V'Ger is the name of the transformed probe and intelligence inside it. The plot ultimately links the alien threat to humanity’s own space exploration.