Edwin was the Chief Medical Officer of Triketha. He was in charge of looking after the Toraxian-stung patient. Mollis wanted him to go back to Earth. He was obsessed with a video of the Second Doctor and his TARDIS. He helped to defend the colony from the insects. Learning from Constance Clarke that she knew the TARDIS she asked where was his son Tarlos.[statement unclear] When Tarlos arrived on the planet he learnt what had happened, but was still angry. He grew paranoid about the Doctor. (AUDIO:Colony of Fear)