- You may be looking for the Celestial Toymaker, who sometimes went by this name.
Mandarin was a dialect of Chinese. In the early 21st century, it was the most prominent language on Earth. About a billion people on Earth spoke Mandarin, three times more than the English language. (TV: Children of Earth: Day One)
The Fourth Doctor stated that he could speak Mandarin, among other Chinese languages. (TV: The Talons of Weng-Chiang) A version of the Doctor from a parallel universe could also speak Mandarin. (AUDIO: Sympathy for the Devil)