Beta XII-A was the uninhabited twelfth planet orbiting the primary Beta Leonis Minoris. This system was located near the Federation-Klingon border, in the Alpha Quadrant.

In 2256, this planet was mentioned with the star Beta Leonis Minoris's name on the star chart "Alpha/Beta Quadrant Overview" in the ready room aboard the USS Discovery. (DIS: "Magic to Make the Sanest Man Go Mad")

In 2268, the crew of the USS Enterprise answered a distress call from a colony. There were a hundred men, women, and children in this colony. According to the distress call, they were under attack by an unidentified starship. When a Klingon battle cruiser was detected approaching this planet, Captain James T. Kirk assumed that the Klingons were responsible for the attack. The Klingons steadfastly denied any involvement in the destruction of the colony.

The incident was later determined to be a fabrication created by an entity to incite a feud between the crews of the Enterprise and the Klingon battle cruiser. (TOS: "Day of the Dove")

For the pre-remastered episode, the planet model for Alpha Carinae II was first used for Capella IV ("Friday's Child"). It was used again for Neural ("A Private Little War", Triskelion ("The Gamesters of Triskelion"), Kelvan planet ("By Any Other Name"), Ekos ("Patterns of Force"), Alpha Carinae II ("The Ultimate Computer"), Triacus ("And the Children Shall Lead"), and unnamed planet ("Is There in Truth No Beauty?"} and for the Medusan homeworld ("Is There in Truth No Beauty?"). It was used later for the Kalandan outpost ("That Which Survives"), Elba II ("Whom Gods Destroy"), and Sarpeidon ("All Our Yesterdays"). For the remastered episode, a new planet model was created by an unknown CGI artist.
The Star Trek Encyclopedia (4th ed., vol. 1, p. 81) classified Beta XII-A as a class M planet.

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