Trebal

Trebal was an Atlantean, and the First Officer of the Aurora. She had served as First Officer for many years under it's captain, and he strongly trusted her. She accompanied the Aurora when she went on a reconnasaince mission to to discover a weakness in Wraith technology. After the ship was damaged, she went into a stasis pod with the rest of her crew. Ten thousand years later, the Wraith discovered the ship. One Wraith removed Trebal, killed her, and took her place, impersonating her to learn how to upgrade Wraith hyperdrives, until John Sheppard revealed the truth.