Taiwanese girl (Children of Earth: Day One)
From Tardis Wiki, the free Doctor Who reference
The Chinese girl was a young girl living in Taiwan. She was briefly possessed by the 456, who made her speak English. She was recorded and posted on the Internet. Torchwood Three were interested, as Mandarin was the most prominent language in the world, and thus it did not make logical sense that aliens would be trying to communicate in English. (TV: Children of Earth: Day One)