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Gandalf was a named used to refer to The Doctor twice. When the Master sent a message to Martha Jones via a television broadcast, he showed her the raged Tenth Doctor, jokingly saying "Say hello, Gandalf." Later, the Eleventh Doctor compared himself to the character, saying he was "the outer space Gandalf". (DW: Meanwhile in the TARDIS)
Behind the scenes
Obviously, in the real world, Gandalf is a character from The Lord of the Rings. Televised Doctor Who never explicitly makes this connection.