Benecia

Benecia is a Class M planet located in the Alpha Quadrant and home to a Federation colony. It is the sole planet in a binary star system of the same name. It is close to the Planet Q and 2 days travel from Castus II at Warp 2. It was settled in 2228, by a collective of scientists hoping to create a utopian existence. Within a few years it was an obvious failure, although the colony did establish a modern (and eventually distinguished) center of the behavioral sciences. Some of the larger settled areas are Benecia City, Darwin Heights, and Talverness.

In 2266, the USS Enterprise took the Karidian Company of Players to Benecia for their next scheduled performance after Captain James T. Kirk arranged to them in order to investigate the possibility that former Tarsus IV Governor Kodos was still alive and operating under the alias of Anton Karidian. Karidian was indeed Kodos, and died when accidentally shot by his daughter Lenore Karidian. Upon the arrival of the Enterprise at Benecia, Lenore was committed to a psychiatric treatment facility on that world, at which Doctor Leonard McCoy stated she would receive the best of care. (TOS: "The Conscience of the King")

In 2269, Janice Lester, who had taken over the body of Captain Kirk, diverted the Enterprise to Benecia, despite the fact that the Enterprise was due to rendezvous with the USS Potemkin. When Spock discovered that Kirk's life essence had been transferred to Janice Lester's body, Lester tried to have Spock, Kirk, and the other senior officers put to death. Lester intended to have Kirk and the other officers buried on Benecia, but before the executions could proceed the remained of the crew revolted, and a few moments later both Kirk and Lester returned to their own bodies. (TOS: "Turnabout Intruder")