Security guard (The Time of Angels)

Security Guard was a member of Alistair's security staff on board the Byzantium Starliner. He was first encountered in DW: The Time of Angels where he was pictured walking confusedly around a forest setting. He was confronted by Alistair who wipes lipstick from his face, revealing it to be hallucinogenic; the calling card of River Song.

Behind the scenes
The Security Guard is played by Britsh Performer Mike Skinner of 'The Streets'.