Angelo (The Green, the Bad and the Ugly)

Angelo was an insect-like creature and one of the aliens that lived on Maught who entered into a fragile "partnership" with Blontt and Tu — with each of the three having one of the necessary co-ordinates to drill down into a long lost underground stream. He obtained the east west co-ordinates (2.14 degrees) but shot Blontt for his betrayal (by attempting to go freelance), before extracting the depth co-ordinates from him. By drilling too deep with false co-ordinates given by the Tenth Doctor, the underground stream was exposed and allowed water to flow across the planet's surface once more. (COMIC: The Green, the Bad and the Ugly)