Doctor William Warner is a surgeon in the United States Air Force stationed at Stargate Command.



Dr. Warner attempted to remove a Goa'uld that had infested Major Charles Kawalsky. The operation appeared to be successful but it turned out that the part that was removed was only a dead husk. (SG1: "The Enemy Within")

Several months later, after a foreign body was discovered attached to the heart of Cassandra, the sole survivor of Hanka, he performed exploratory surgery on her and was able to scrape some samples of the device for biopsy. He was unable to remove the device because it was booby-trapped by Nirrti to kill the girl if there was any tampering with it. (SG1: "Singularity")


When the aliens that impersonated the Spirit guides of the inhabitants of PXY-887 infiltrated Stargate Command, he was one of the many personnel to disappear by their power. One of the aliens, Xe'ls, impersonated him until it was discovered by SG-1 and shot with a Zat'nik'tel. (SG1: "Spirits")


When Colonel Jack O'Neill and Dr. Janet Fraiser were infected with one of Ma'chello's Goa'uld killing organism, he talked Major Samantha Carter through the steps involved in removing the a protein marker from her blood that was left over from the death of Jolinar of Malkshur so it could be safely injected into them. (SG1: "Legacy")

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