The Machine Planet is a planet located in an unknown area of space, home to a race of sentient machines. When the Voyager VI probe fell into a black hole in the 21st century, it reemerged in this planet's system, and was repaired and expanded by the machine race, becoming V'Ger. (Star Trek: The Motion Picture)
- Fandom speculation at the time of TNG: "Q Who?" (and later) believed that the Machine Planet was the Borg homeworld. This idea also appeared in the non-canon novel "The Return". However, no Borg homeworld has ever been mentioned in Trek.