Santa Claus

Santa Claus — also known as Father Christmas or, according to the Eleventh Doctor, Jeff (TV: A Christmas Carol) — legendarily distributed presents to good children on Christmas morning under their trees. He played an important part in the Christmas tradition on the planet Earth.

Profile
Santa maintained a workshop where he created toys. It used to be located at the North Pole, but due to the aeroplanes which began flying over it in the 20th century, he moved it to an unnamed planet. (COMIC: A Christmas Story) In order to deliver presents to all children in a single night, Santa used time loops and clones of himself. (PROSE: The Man Who (Nearly) Killed Christmas)

He was married to Mary Christmas. (AUDIO: The Claws of Santa)

Appearances
The First Doctor visited Santa Claus in his workshop and helped save Christmas. (COMIC: A Christmas Story)

The Second Doctor warned Santa of a future where the toy workshop spanned over two thousand worlds and the fabric of space was being torn by his time looping. A solution was found involving a fleet of robot Santas and newly calculated, more stable wormholes. (PROSE: The Man Who (Nearly) Killed Christmas)

The Third Doctor and Sarah Jane Smith travelled to New York in 1822, where they met Saint Nicholas. Clement C. Moore watched them from his window, and then sat down to write Twas the Night Before Christmas. (PROSE: A Visit from Saint Nicholas)

Santa helped Iris Wildthyme save Panda from Mary Christmas. (AUDIO: The Claws of Santa)

Astrolabus claimed to be Santa. (COMIC: Voyager)

Following the Twelfth Doctor's parting with Clara Oswald, Santa Claus entered the Doctor's TARDIS. He told the Doctor that Clara was not happy with their separation and asked him what he wanted for Christmas. (TV: Death in Heaven)

Impersonations
The Fourth Doctor dressed as Santa and sneaked into the Brigadier's house with Romana II in order to leave him a Christmas present. (PROSE: Better Watch Out, Better Take Care)

On Christmas Eve 2006, Rose and Mickey Smith encountered dangerous "pilot fish" disguised as Santas. (TV: The Christmas Invasion)

On 25 December 2007, the same robots, now under control of the Empress of the Racnoss, attacked Donna Noble and Lance Bennett's wedding reception. (TV: The Runaway Bride)

Behind the Scenes

 * Santa Claus and Father Christmas have different origins and are technically different individuals. However, the character portrayed by Nick Frost in TV: Death in Heaven is identified in the closing credits as Santa Claus, although UK media tended to refer to him as Father Christmas both in reviewing the episode, and in pre-broadcast coverage of the 2014 Christmas special.
 * In An Adventure in Space and Time, Verity Lambert (Jessica Raine) describes the Doctor as "C.S. Lewis meets Father Christmas".