Pilot Fish 3

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
"One of the group of killer aliens who disguised themselves as Santas and arrived on Earth in search of the Doctor."

- Pilot Fish 3's profile.

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