Pilot Fish 2

A Roboform was one of a group of four who appeared on Earth disguised as Santa Claus. Appearing in advance of the Sycorax invasion of Earth, they were likened by the Tenth Doctor to pilot fish. (TV: The Christmas Invasion)

Behind the scenes
"Shortly before the Sycorax invasion one Christmas Pilot Fish disguised as Santa Claus attacked Rose and Mickey."

- Pilot Fish 2's profile.

Three of the four Roboforms seen in The Christmas Invasion were each represented by an individual Battles in Time trading card.