Goodthing

Goodthing was a human colonist of the far future who lived in the colony planet Gliese 581 D.

She was among the set-up 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.

When she desperately tried to warn Kezzia about the deaths and told her to keep smiling to avoid the same fate, she could only watch in horror as Kezzia was ripped apart by the Vardis before she became their next target. She was then killed.

The Twelfth Doctor and Bill later came across her remains, along with the bones of the other colonists who has been turned into fertiliser. (TV: Smile)