Maddenjot

 was second in command aboard the Teuthoidian ship. Hectocot ate him for insubordination. However, due to the effect of opposite ends of the universe being adjacent, another ship with him aboard, alive and well, came into existence. He was in the Chaos pool anti-chamber and was commanded by the White Guardian to search for the Fifth Doctor and Romana II inside a crystal segment of the key. (AUDIO: The Chaos Pool)