Roboform

Roboform travelled (as the Doctor said, like pilot fish) alongside invaders who took anything on the planet of value to them before the main threat (the metaphorical shark) arrives.

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 * It is also unknown as to who actually created them or for what purpose.

Dressed in Santa costumes and therefore nicknamed Robot Santas, they obviously wore 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. They attacked Rose Tyler and Mickey Smith and sent a robotic Christmas tree to their home. The Roboforms were driven off when the Doctor awoke. (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. (DW: The Runaway Bride) Unmasked, the Robot Santas had golden faces, with black robes and hoods. They were armed with guns when under the influence of the Empress of the Racnoss. (DW: The Runaway Bride)