Anubis

"You do not understand how bad Anubis is. He was banished by the System Lords because his crimes were unspeakable. Even to the Goa'uld."

- Selmak

Anubis was one of the most powerful&mdash;and evil&mdash;Goa'uld in history. Once a powerful System Lord, Anubis was banished by Ra and the others because his actions were deemed unspeakable, even among the Goa'uld. He was believed destroyed, but managed to escape and trick Oma Desala into helping him to ascend, but the Ancients did not want the Goa'uld to join them on a higher plane of existence, and forced him into a state between mortal existence and ascension. Because of his knowledge of the Ancients, Anubis amassed unimaginable advanced technologies, gathering strength for hundreds of years before returning to take his revenge upon the System Lords and dominate the galaxy.

Early history
Long ago, Anubis first arose as a warlord in the service of Apep. His victories earned the praise and respect of Apep, but earned the jealousy of his fellow underlords. However, Anubis' ambition was even greater. Exposing Apep to the unbstable effects of the Ancients' healing device, Anubis learned of valuable Ancient weapons: the Eyes of the Goa'uld, six jewels used to power a planet destroying weapon. Eventually, he felt his position was so secure that he murdered Apep, removing the symbiote from his host and devouring Apep before the others, and declared himself Emperor the Goa'uld.

However, Anubis seriously underestimated the following of Apep and the power of the rival underlords. Ra was able to rally the others in Apep's name, and in a three hundred year civil war, defeated Anubis. Ra emerged as the Supreme System Lord of the Goa'uld Empire, and Anubis was banished. The superweapon was destroyed, and Ra redistributed the eyes among himself, Apophis, Osiris, Seth, and Tiamat.

Thousands of years later, Anubis reemerged, and offered to destroy the Asgard in return for the leadership of the System Lords. A furious Ra waged another war against him, but Anubis was able to survive. He would reemerge five years after Ra's death, but as a much greater threat.

Ascension
Travelling to Kheb, Anubis underwent the tests of the rouge Ancient Oma Desala. Passing them and decieving her, Oma concluded that Anubis was worthy of ascension. However, once she had begun the ascension process, she realized how truly evil Anubis was. By then, it was too late. Oma was unable to descend Anubis on her own, so the Others were forced to do so, but only in a partial manner.

However, they had become frustrated with Oma's breaking of the rule of non-interference. As a punishment to Oma Desala, the Others allowed Anubis to use any knowledge he could have as a regular Goa'uld. However, they did take some of the knowledge he had obtained while ascended, such as the location of Atlantis and the location of the Sangraal. Physically, Anubis remained some form of energy, and wore a mask to keep his form intact. It appears like the liquid-like event horizon of the Stargate, akin to the Ancient's technology.

Return
After the deaths of Apophis and Cronus, Anubis began to make his presence felt among the Goa'uld again. He brought in many underlords to serve him, such as discredited Osiris and Thoth, and newer Goa'ulds such as Zipacna and Tanith. He used his advanced shield technology to force the Tollans into providing new weapons for him, but the Tollan Narim destroyed them, causing Anubis to devastate Tollana. When the High Council of System Lords met, Anubis sent Osiris to them as his emmisary, demanding to be restored to his former position of System Lord. Despite the objections of Lord Yu, Anubis was restored to the state of System Lord. At the same time, Anubis ordered Zipacna to launch an attack on Revanna, seeking the symbiote poison. This objective failed, but resulted in wiping out virtually all the Tok'ra on the base.

Finally, Anubis felt secure enough to challenge the Asgard. His shields and modifications to staff cannons allowed him to fight the Asgard in limited numbers. Convinced he no longer needed to fear them, Anubis used a Stargate destroyer in an attempt to destroy Earth. The Beta Gate was destroyed, but the weapon was also destroyed.

Fearing the reprisals of the System Lords, Anubis built a new mothership carrying a powerful superweapon. The vessel single-handedly destroyed an entire fleet of System Lord motherships with the combined powers of the Eyes, as well as annihilating the planet Abydos. The vessel was destroyed when the System Lords attacked it at Langara, but Anubis escaped.

Sensing the threats of the Jaffa Rebellion, Anubis began researching a way to create a new footsoldier. Using the technology of the Ancients' healing device and Jonas Quinn's memories of Egeria, Anubis engineered an army of nearly unstoppable Kull warriors. The Kull warriors were far superior to the Jaffa, and Anubis quickly regained much lost ground.

When he learned of an Ancients' repository of knowledge on P3X-439, he sent a force to secure it. However, Jack O'Neill managed to download the knowledge into his mind. Believing the Tau'ri possessed Ancient technology, he attacked Earth with his fleet. Anubis was apparently destroyed by the drone weapons that SG-1 found in the Antarctic outpost buried under the ice of Antarctica. However, his formless essence survived the explosion of his mothership. He hitched a ride on a Russian space craft, possessing the body of a cosmonaut and returning to Earth. Leaping from person to person he made his way to Stargate Command, where he managed to escape through the Stargate in the body of the dying Russian officer Alexi Vaselov -- but he found himself frozen near the gate on an ice-covered planet, trapped.

Defeat
Somehow, Anubis returned, and became the power behind Ba'al's rise to power. When the Replicators began their invasion of the Milky Way, Anubis ordered his fleet to attack them head on, allowing the Replicators to acquire materials. When the Rebel Jaffa took Dakara, Anubis ordered Ba'al to take the fleet to reclaim the planet at all costs. Knowing that Anubis intended to use the superweapon on Dakara to destroy all life in the Milky Way galaxy, Ba'al worked with Samantha and Jacob Carter to modify the weapon to destroy the Replicators. Undaunted, Anubis took the remaining Kull warriors in an attempt to carry out his plan.

When he entered a midpoint between ascension and human existence to mock Oma Desala, he found Daniel Jackson, also at the midway point. He took the persona of Jim, a patron in the Astral Diner, mocking Oma and subtly pointing Jackson in the direction of Oma as the cause of Anubis' ascension. When Jackson realized that Jim was Anubis, he attempted to attack the System Lord, but lacked the power to even attack him. By this point, the Kull warriors had secured control of Dakara, and Anubis was in place to destroy life in the Milky Way. However, he was stopped by Oma Desala.

Inspired by Daniel's actions, she engaged Anubis in eternal struggle. Neither one can, which prevents Oma from helping others to ascend, but Anubis would be forced to concentrate on fighting her back, also preventing him from ever harming the galaxy again. With a cry of rage and fear, Oma and Anubis ascended to the higher planes, ending his reign of terror over the galaxy.