Arnold Underwood was a patient at the hospital where Rory Williams worked in London.
While reading a book as he waited for a prescription, he was approached by a pair of identical orderlies. Although he explained he did not need care, they ignored him. Upon removing their masks and seeing their grill-like mouths, Arnold screamed and was taken to the Shakri ship, where he was killed, either directly by the Shakri interface system or by the destruction of the ship caused by the Eleventh Doctor. (TV: The Power of Three)
