The Units wore masks that connected them as a group mind. Akimus Makassar's mask worked as a processing centre, which meant that he could control the will of anyone in the group mind. (PROSE: The Masks of Makassar)
Omega wore a mask as he resided in the anti-matter universe. He noted that the Second and Third Doctors would need such masks in time if they were to remain in the anti-matter universe. When Omega removed his mask to prepare for his departure, he discovered that the anti-matter universe had completely dissolved his physical body. He could not leave his universe; he existed only because his will insisted that he exist, but his will was all that was left of him. (TV: The Three Doctors)
Voord masks altered the wearers genetic code and turned them into a Voord, provided they were willing to go through with the ritual. The mask became part of the wearer in the process and removing it could lead to disfigurement. (AUDIO: Domain of the Voord)
Señor 105 made masks representing every element on the periodic table. According to some rumours, he gained powers when he wore the masks. (PROSE: Iris Wildthyme y Señor Cientocinco contra Los Monstruos del Fiesta)
Joy believed that a Silent looked the way it did because it wore a Star Trek mask. (TV: The Impossible Astronaut) Similarly, a hospital porter in Cardiff believed a Weevil's face was a convincing mask. (TV: Everything Changes)
Behind the scenes
- Masks. BBC - Blogs - Doctor Who. Retrieved on 24 January 2013.