Talk about it here.
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. (TV: Last Christmas) According to the Eighth Doctor, Rudolph was invented by a department store in 1939. (AUDIO: Death in Blackpool)
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. Later Rudolph along with Donner and Blitzen pulled Santa's sleigh with the Doctor, Clara and the three remaining scientists Ashley Carter, Shona McCullough and Rona Bellows on board.
Other references Edit
While at the Nadir Motorway Service Station, a man dressed as Father Christmas approached the Eighth Doctor and Patricia Ryder and asked if anybody had seen his reindeer, one of which was Rudolph. (AUDIO: Death in Blackpool)
Behind the scenes Edit
A rendition of the aforementioned song was sang by Strax in the non-valid webisode Songtaran Carols, during which he exclaims Rudolph's glowing red nose was a tactical disadvantage, as it allowed Strax to punch him in the dark.