Synopsis
In the serial, the Sixth Doctor is tried by the High Council of Time Lords for breaking several of the laws of Gallifrey, the Time Lords' home world, including interference with outside worlds and genocide. A mysterious character called the Valeyard acts as prosecutor. In the first two chapters (The Mysterious Planet and Mindwarp) events from the Doctor's past and present are submitted as evidence of his guilt. The third chapter (Terror of the Vervoids) presents future events in the Doctor's defence. In the concluding chapter (The Ultimate Foe) the Doctor's trial is halted, and the Doctor confronts the Valeyard and his old rival, the Master, in order to clear his name and to save the High Council.
Read more about this topic: The Trial Of A Time Lord