Ria (Lies in Ruins)

Ria was an android companion built by the Eighth Doctor during the Last Great Time War. He built her to be the "perfect companion", to tell him that what he was doing during the Time War was right. They met Bernice Summerfield and River Song on a planet with a large alien ruin. In reality, the planet was a Prototype TARDIS that took a form resembling the remains of the Time Lord homeworld of Gallifrey. She was badly damaged and "died" when a group of scavengers attempted to salvage resources from the supposed Planetary remains. (AUDIO: Lies in Ruins)