While not a Gou'ald, the Replicators have caused havoc in the universe almost entirely wiping out the Asgard race.  Replicators have evolved into human-looking bipeds in order to advance and conquor.

Played by: Patrick Currie

First Seen: SG1-612, "Unnatural Selection"
Destroyed: By Carter2, in SG1-811, "Gemini"