Cassandra Fraiser

Rescued by SG-1 and adopted by Dr. Janet Fraiser, this young girl is the sole survivor from her world. SG-1 found Cassandra alone on her world, the planet Hanka, after the Goa'uld Nirrti had wiped out her planet (and an SG team). They brought her to Earth, but soon learned that Nirrti had planted a Naquadah Bomb in Cassandra's chest to try and destroy Earth's Stargate. The disaster was averted, and Cassandra now lives a normal life on Earth. She was adopted by Fraiser, the S.G.C.'s chief medical officer. Cassandra retains the ability to sense the presence of a Goa'uld, because of the Naquadah that remains in her system (from Nirrti's bomb). When she briefly exhibited powers of telekinesis, SG-1 returned to her home planet and discovered that Nirrti had been using her people for experiments to create a Hok'taur -- an advanced human -- to be her new host.

Cassandra is in high school