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Excalbia was an inhabited planet located in an unidentified solar system. This was the homeworld for the Excalbians, an advanced carbon cycle intelligent species.

The planet had a poisonous atmosphere and a surface that consisted mostly of molten lava. The planet was located hundreds of light years from Earth.

In 2269, the USS Enterprise was sent to Excalbia by Starfleet to confirm several "old space legends" about the planet, which suggested that the planet was home to intelligent life. Orbital scans of Excalbia revealed several scientifically anomalous readings, with indications of artificial power being generated in factor seven quantities, indicating the presence of a considerable civilization.

As the Enterprise prepared to warp out of orbit, the ship was subjected to an incredibly swift deep probe from the planet. Moments later, the ship was contacted by the image of Abraham Lincoln, who eventually convinced Captain Kirk and Spock down to Excalbia's surface, where they were subjected to an Excalbian experiment on the nature of good and evil conducted by Yarnek with Kirk and Spock's unwilling participation. Yarnek recreated several historical figures thought to embody the concepts of good and evil, and pitted them in combat against each other before the Enterprise crew was allowed to depart. (TOS: "The Savage Curtain")

In 2328, this was home to the Excalbia Tourist Resort. (TNG-R: "Inheritance", okudagram)

According to The Worlds of the Federation, Excalbia is the first planet in its system.
According to Star Trek: Star Charts (p. 23), Excalbia was classified as an E class planet.