Fringe: Season 2, Episode 11

2 - 11: Unearthed

A seventeen-year-old girl, Lisa (Alice Kremelberg), comes back from the dead. Fringe Division investigates, and it is soon determined that at the same time, a soldier named Rusk was murdered, making them believe Rusk's consciousness has possessed Lisa. The team discovers Rusk is on a mission to take revenge on his wife who had him killed. Walter posits that, due to a heavy radiation exposure, Rusk's energy wasn't completely expended, and thus able to possess Lisa. Rusk possessed Lisa long enough to deal with his wife and until Lisa is eventually able to purge him from her consciousness. The episode was produced as part of season 1, as Charlie Francis is seen alive in the episode. However, it went unaired until season 2.