Goauld, the egyptian sun god.
Defeated in the Stargate movie.

Goauld. System lord that raided earth for hosts, thus causing the start up of the current Stargate program.

Apophis: A single human life is worth so much you would risk a world?
Jack O'Neill: That's right. That's why they call us the good guys.

Goauld.

Daniel: She's Hathor, the goddess of fertility, inebriety, and music.
Jack: Sex, drugs, and rock & roll?

U.S. Senator that went to great lenghts to try and stop the stargate program.

Goauld inhabiting Skaara, a boy from Abydos. Offspring of Apophis and Amonet.

Goauld, depicting an old egyptian death god.

An alien species normally invisible to humans, who decided the best way to defeat the goauld is to kill all possible hosts.

Goauld.

Goauld inhabiting Daniel's wife, Sha're. Wife of Apophis.

Seriously Injured (-ma) by <a href="http://fumbbl.com/FUMBBL.php?page=match&id=1122541">cheesy rastards</a>

Otherwise known as 'the destroyer of worlds'. A brilliant scientist who will do anything to further her needs. (Name sometimes written as "Linea")

"There are many forms of power my dear, some more subtle than others."
- Linnea to Carter, "Prisoners"

USAF Officer who has been charged by the Pentagon to find technology to defend earth. He does not care much about the SGC or about those that stand in his way of completing his mission.

Maybourne: Striking an officer is a quick way to a court martial.
O'Neill: I'm not gonna hit you, Maybourne. I'm gonna shoot you.

Maybourne: Jack. How long has it been?
O'Neill: Oh, since you got us stranded off-world and tried to kill me.
Maybourne: Ah. Takes me back.

Self replicating intelligent machines that are hostile to everyone and every thing.

Goauld. Was captured on earth for centuries in a stasis jar but released when found by an archeological team. Took a former colleague of Daniel's as a host.