Roboform

Described as pilot fish by the Doctor, these Robot Santa Clauses travelled alongside invaders who take anything on the planet of value to them before the main threat (the metaphorical shark) arrives. The Robot Santas are humanoid and dressed up in Santa costumes, but had obviously fake masks. In their first encounter in 2006, they were attracted by the energy being released by the Doctor and wanted that source of energy themselves. (DW: The Christmas Invasion) In the second invasion of 2007, they worked for the Empress of the Racnoss and were helping her in her plans. (DW: The Runaway Bride)




 * Their actions imply that the Robot Santas were mercenaries who stuck with the most powerful forces (either the Sycorax or the Empress of the Racnoss).

These robots were armed with trombones that fired mortar shells, trumpets that fired bullets, tubas that were used as flamethrowers, remote controls that were used to control Robotic Christmas Trees, and possibly more.

The Robot Santas had golden faces (when unmasked), with black robes and hoods. They were armed with guns when under the influence of the Empress of the Racnoss. (DW: The Runaway Bride)


 * Exactly why these creatures chose to disguise themselves as Santa (and specifically as Santa musicians in The Christmas Invasion) has yet to be explained.