Marcos XII

Marcos XII is a planet located in either the Alpha or Beta Quadrant.

In 2268, the non-corporeal being known as Gorgan wanted to conquer Marcos once he had been liberated from Triacus. Using the children of the Starnes Exploration Party, Gorgan was able to gain control of the USS Enterprise and head for Marcos. Fortunately, he was defeated by Captain James T. Kirk and the children. (TOS episode: "And the Children Shall Lead").