A nameless, violently unstable planet of earthquakes, eruptions and sudden changes of gravity and weather, where the stolen Soul of the Skorr is hidden in The Jihad.
The mad planet is the setting for most of the Animated Series episode The Jihad. It has no other name. Its surface is in constant upheaval, with volcanic eruptions, quakes, sudden storms and freezes and shifts in gravity, and three earlier expeditions sent there by the Vedala have been lost.
Kirk, Spock, Tchar, Sord, Lara and Em/3/Green cross it in a ground vehicle and on foot to reach a fortress where the Soul of the Skorr is kept. Winged mechanical sentinels attack them, the vehicle is lost and the group comes to suspect a traitor among them.
The thief is Tchar himself, who wants the Skorr to become warriors again and welcomes the holy war the theft would cause. Kirk and Spock overpower him in a weightless fight inside the fortress, and the Vedala brings everyone back.