Zaddik

Zaddik was a human who adopted a Wraith Ellia whom he rescued as a young child. from lone Wraith Dart had crashed on the planet years ago and, though the villagers had slain all Wraith that survived the crash, Zaddik spared the baby he found because of its apparent innocence. Raised with compassion and love, treated as no different from any human daughter. When Ellia grew she needed to feed on human life force so Zaddik afford him self Ellia refused but he persuaded her to feed so Zaddik began experimenting and developed a serum as an alternative. According to Zaddik, Ellia has never fed on a human. other then him but doesn't tell the atlantis team until the end.

Instinct
The Atlantis team went this planet and to the town people the towns people tell the of a beast in the wood whos feeds on humans. believing it was a Wraith the members of the Atlantis team begin to search the surrounding forest for what they have deduced is a lone Wraith soldier. While searching in the woods for the Wraith that had been terrorizing the village, the Atlantis team meets a man named Zaddik. Zaddik tells them of Ellia of the story and how he made a serum to suppress the wraith's need to feed, Dr. Beckett visits Zaddik and Ellia's home to study the serum, and Ellia overhears him mention a retrovirus he is developing to potentially turn Wraith into humans. Ellia hates being a Wraith, and takes the drug without Dr. Beckett's knowledge, despite the fact that it isn't yet ready. The retrovirus has the exact opposite effect intended, and increases the effects of the Iratus bug on her DNA.

Ellia confesses to Zaddik that his serum has never worked and she has been feeding on humans in the village for years. Another Wraith survived the crash, an adult male, and Ellia had been following him to feed whenever he did, hiding her involvement by only picking the scraps he left behind. The effects of the retrovirus appear to grow in intensity over time, and she becomes increasingly violent. She throws Zaddik against a tree and runs away. As he is dying, he reveals that while he was developing the serum he allowed Ellia to feed on him to relieve her hunger. He was, in fact, the missing son of one of the villagers; and his apparent age is only a result of the feeding of Ellia. Colonel Sheppard tracks Ellia down, and though he tries to convince her to return with him and be treated to reverse the effects of the retrovirus, she attacks him and begins feeding on him, and he and Ronon are forced to kill her.