An underlord in the Goa'uld political structure, Zipacna tends to serve whatever Goa'uld is in power. He was once allied with Apophis, and then served Apophis's son Klorel when the System Lord was killed. Some years following Klorel's downfall Lord Zipacna moved into the service of Anubis, who was just returning to power after a long absence.
Zipacna represented Klorel's interest at the Tollan Triad, which determined whether Skaara or Klorel had priority over his body. He voted in favor of Klorel, of course. But Klorel was removed from Skaara's body, and Zipacna called his vessel to rain fire down upon the planet before escaping through the Stargate.
Zipacna was responsible for enlisting the aid of Osiris to stand alongside her old acquaintance Anubis, and to represent him at the summit of the Goa'uld System Lords. Having captured a Tok'ra spy and using Anubis's technology to find the location of their primary base, Zipacna led a devastating attack upon Revanna, wiping out the Tok'ra there. But he failed in his secondary objective of finding the formula for the symbiote poison the Tok'ra had developed.
Pretense - Zipacna argues for the Goa'uld Klorel's right to Skaara's body, and moves to attack the Tollan homeworld when the verdict (as expected) does not go his way.
Summit - Having allied himself with the powerful Goa'uld Anubis, Zipacna commands a devestating assault on the Tok'ra base on Revanna.
Last Stand - Zipacna fails to capture the formula for the Tok'ra's symbiote poison, and his ground forces fall victim to it. His final fate remains unknown.