Rudolph (Last Christmas)

Rudolph, also known as Rudolph the Red-Nosed Reindeer, was one of Santa Claus' many reindeer who lived on the North Pole with Santa, the other reindeer and all Santa's elves.

During Christmas, Rudolph, two other reindeer, Santa, his sleigh and elves Ian and the Wolf crash landed on the roof-top of the house Clara Oswald lived in.

Later Santa rode on Rudolph's back to the North Pole to help out the Twelfth Doctor, Clara and four scientists escape from dream crabs. When Rudolph acted up, Santa parked him with a key, which calmed him down and turned off his red nose.

Rudolph could not fly by himself, so Santa fed him magic carrots. (TV: Last Christmas)