Grandsanta's pet reindeer is a supporting character in the 2011 film Arthur Christmas.

He is Grandsanta's elderly pet reindeer who travels with his owner, his grandson Arthur and an elf named Bryony via Grandsanta's old sleigh Eve (pulled by the great-great-grandchildren of Santa's original eight reindeer) to deliver a bike to a young girl named Gwen after it is forgotten accidentally.

It is never revealed in the film if this reindeer is one of the original eight reindeer or an ordinary reindeer.

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