The London Eye hosts an unusual visitor - horse puppet "Joey" who is the star of the West End production, "War Horse". The play is celebrating its 2,000th performance. Since its premiere at the National Theater in October 2007, War Horse has been seen by over two million people in London and 4.6 million worldwide. The World War One tale is about a boy and his beloved horse, who is sold to the cavalry. The boy is too young to enlist but sets off on a perilous journey to bring his horse home.