Thoris Amarnis IV was a planet, the fourth planet of the Thoris Amarnis system, located in the Free Trader Lanes sector of the galaxy's Alpha or Beta Quadrant. It was the homeworld of the undeveloped Thorian civilization.
History and specifics
In the 23rd century, glowing Thorian blood rocks provided the planet's inhabitants with cooking heat and light.
The USS Bold Venture joined the Enterprise in orbit, unaware that a cloaked Free Trader starship observed them both. Cadets being held aboard the pirate starship sabotaged its cloaking device. Captains James T. Kirk and Vera DiMarco were then able to rescue the cadets and capture the pirate captain. (TOS comic: "The Nogura Regatta")