Goodthing
From Tardis Wiki, the free Doctor Who reference
Goodthing was a human colonist of the far future who lived in the colony planet Gliese 581 D.
She was among the advance team who were awoken from stasis to make sure the city was functioning properly. At some point, she discovered her mother and several other colonists had been killed by the Vardis but she realized that it was because they showed negative emotions such as grief. (TV: Smile)