Stargate Atlantis (2004)

S5E18 Identity

In a twist of fate, the resourceful thief Neeva Casol seizes control of Dr. Jennifer Keller's body. As Neeva schemes to flee from Atlantis, Keller faces dire consequences on a different planet, where she is sentenced to death. With time running out, the team must urgently devise a plan to rescue Keller and restore her to her rightful form before it’s too late.