Steven Caldwell's Goa'uld

From SGCommand

"I must warn you, as a Goa'uld, I now possess the strength of many men."
"It'll be a fair fight then."

—Caldwell's Goa'uld and Ronon Dex

Steven Caldwell's Goa'uld was a Goa'uld working for the Trust, and managed to take Colonel Steven Caldwell as a host.

[edit] Biography

This Goa'uld rigged the ZPM used to power Atlantis to explode by removing the failsafes to retained power, in the hopes of preventing the Wraith from making it to the Milky Way. He also sent a distress call to the Wraith, and caused the city's inertial dampeners to power up. Laura Cadman soon discovered that Caldwell's access code was used to access the Atlantis' operations. Weir, Sheppard and Ronon confronted the Ga'ould and he finally revealed himself to them. The Goa'uld warned John Sheppard and Ronon Dex that he would defeat them, but Ronon was able to easily overpower him, and Sheppard tasered him, allowing Caldwell to regain control of his body for at least a few minutes and tell them the required access code.

Hermiod then used beaming technology to remove the symbiote from Caldwell. Caldwell survived, but the symbiote's fate is unknown, but it was most likely killed. (ATL: "Critical Mass")