Ettis was a Peladonian trisilicate miner. He strongly opposed the presence of the Galactic Federation on Peladon, and led a rebellion against Queen Thalira. When the Ice Warriors led by Azaxyr took over, he attempted to destroy the Citadel with the sonic lance. Ettis was discovered by the Third Doctor, who tried to dissuade him from activating the device, but after the confrontation a sword fight with the Doctor ensued. Ettis defeated the Doctor (who was left unconscious in the cave) but was killed himself when a self-destruct mechanism on the sonic lance was activated on the orders of Azaxyr. (TV: The Monster of Peladon)