Rosto the Trell (AUDIO: Sisters of the Flame)
The Trell resembled ten-foot long intelligent centipedes. They were a peaceful, highly ordered race and were almost incapable of acts which might be considered illegal. Their eyesight was far superior to that of humans. In an alternate timeline, many of the Trell were brainwashed and enslaved by Morbius as his foot soldiers. (AUDIO: Sisters of the Flame, The Vengeance of Morbius)
The Trell were among the many alien races to be hypnotised by the Eight Legs when they attempted to use a stellar manipulator to take control of all races in the universe. (AUDIO: Worldwide Web)
A Trell once came under attack by the Sontarans. (AUDIO: The King of Sontar)