A visit to a planet where the SG-7 team has established an observatory turns out to be less than routine when SG-1 finds SG-7 and several of the locals dead of an unknown disease. O’Neill declares an immediate biohazard situation and calls for backup from Earth, shortly before the only survivor of a village of 1,000 people is found – a little girl who clings to Carter and yet seems unable to tell anyone what happened. Dr. Fraiser finds something unique about the young survivor – she has naquahdah, the material from which the stargate itself is made, in her blood. Back at the SGC, the girl finally tells Carter that her name is Cassandra, and then collapses. An X-ray reveals something foreign near the girl’s heart, but any attempt to directly sample it or remove it reveals that the device has the ability to stop her heart. Further study reveals it to be a bomb capable of producing a massive nuclear explosion. On the planet, O’Neill and Teal’c have stayed behind to monitor the eclipse that the SG-7 observatory was built to track – and through the telescope, they spot those responsible for turning Cassandra into a walking bomb.
Guest Cast: Teryl Rothery (Dr. Fraiser), Katie Stuart (Cassandra), Gary Jones (Technician), Kevin McNulty (Dr. Warner)
LogBook entry by Earl Green with notes by Dave Thomer