Sycorax mask

A type of mask was worn by Sycorax warriors. (TV: The Christmas Invasion)

History
The warriors assembled aboard the Sycorax spaceship which waged the Sycorax invasion of Earth in December 2006 appeared with masks. After the image of a group of masked Sycorax was transmitted to Earth by the Guinevere One space probe, British Prime Minister Harriet Jones was informed by Alex Klein that the image had been passed of as a hoax involving students with a "sort of mask or prosthetics" hijacking the probe's signal. Fadros Pallujikaa, the Sycorax leader, removed his mask when addressing Harriet and her company aboard the Sycorax ship. (TV: The Christmas Invasion)

A Sycorax patron at the Zaggit Zagoo bar on Zog wore a mask. (TV: The End of Time)

A pair of Sycorax who appeared amongst representatives of the Alliance in the Underhenge appeared with masks. (TV: The Pandorica Opens)

Clyde, a Sycorax who the Thirteenth Doctor met at a Judoon prison, was seen with a mask. (TV: Revolution of the Daleks)

Behind the scenes
The Sycorax mask was represented by a Battles in Time trading card.