While exploring BP6-3Q1, Col. Jack O'Neill and the SG-1 team are attacked by giant insects. The team escapes through the stargate, but not before Teal'c is stung. When Teal'c returns to Earth, he begins to undergo a strange transformation as the insect virus mutates his DNA into something like its own

The change baffles Capt. Samantha Carter and geneticist Dr. Richard Harlow, and it terrifies Teal'c, who makes O'Neill promise he'll stop the transformation � by lethal means, if necessary

Unfortunately, Teal'c's condition intrigues Col. Maybourne, who sees the insect venom as a potential biological weapon. Maybourne uses his presidential mandate to take custody of Teal'c � who escapes while being transferred, leaving behind his Goa'uld larvae

Teal'c hides out on the mean streets of the city, where he is befriended by Ally, a young homeless girl. Meanwhile, O'Neill and the team return to BP6-3Q1 to capture one of the insects, for medical research into an antivenom. While there, they discover the insects' terrible power: They bypass normal breeding by genetically transforming their victims into their offspring

With time running out, the team at Stargate Command must devise a vaccine and keep Teal'c's larval Goa'uld symbiote alive. Most important of all, they must find Teal'c before Maybourne does

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