The Utopia colony was a human settlement located on the planet Mars and established some time prior to the mid-2150s. The colony was threatened in 2155 when a group of xenophobic humans known as Terra Prime took control of the nearby Verteron Array. To prevent the array from being misused as a weapon, Starfleet determined to destroy it; destruction of the array threatened to destroy part of the colony. (ENT episodes: "Demons", "Terra Prime")