Adrian Conrad's Goa'uld

Adrian Conrad's Goa'uld was a matured Goa'uld from a Jaffa captured by the Russians sometime during their brief Stargate Program. It matured by 2001, and was sold for $3 million in a Cayman Island account from Colonel Maybourne to Zeditron Industries, and Adrian Conrad. The Goa'uld took control of Conrad, cured his illness and tricked Diana Mendez into releasing him, before killing her. The Goa'uld and host were captured by Frank Simmons for information, before he and the Goa'uld were captured by the proper authorities. By 2002, the Goa'uld was released in exchange for the rogue NID not to destroy the Prometheus and Nevada along with it. The Goa'uld took Simmons its host after Simmons killed Conrad, though the Goa'uld itself was killed by O'Neill and Teal'c by flushing it into space.

Clones
Little did Stargate Command knew, Immunitech Research used the symbiote's stem cells to clone more symbiotes, though they would only be strong enough to take over its hosts during the night, while they slept. This would leave the hosts disorientated and fatigued during the day. The symbiotes would also have no naquadah in their systems, making them undetectable by Teal'c and Major Carter. The symbiotes all inhabitted the residents of Steveston, Oregon to build a spaceship and leave Earth. They also planned to clone more and infiltrate the NID, though thanks to Richard Flemming's vaccine, Carter was able to stop that from happening, and the hosts were freed from the Goa'uld's control.