Terrellian II is a planet located in Quadrant IV, occupied by the formerlly nomadic Terralyns. Prior to the Terralyns' arrival, the planet was known as Thelema. A radioactive cloud forced the Thelemites to implant their minds in the local plant life while the cell structures of their bodies were used to form Zar-Tan. After Zar-Tan's return on stardate 2314.6, the Thelemites were restored and now co-exist with the Terralyns. (TOS comic: "The Empire Man")