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In the science fiction series Stargate SG-1, the Asgard are a benevolent, highly advanced and evolved race from another galaxy, called Ida, who have visited Earth on many occasions, giving rise to the Norse legends. They were part of the Alliance of four great races. They replaced the deceased and ascended Ancients as the Milky Way Galaxy's most advanced race. Their policy in the Milky Way is generally to oppose the Goa'uld.

The Asgard possess a higher level of technology than the Goa'uld. Their ships are capable of traversing thousands of light years of space in minutes. They have also mastered advanced transporter and holographic projection technologies. Their ships are capable of operating with as few as one Asgard on board. This suggests that their ships possess many automated systems. However, this is not standard procedure as, in certain episodes, Thor has made references to evacuating the crew off the ship.

They do not reproduce in the strictest sense; continuity as a species is maintained through a process of cloning and mind transferal, although this has resulted in a decay of the Asgard genome which will eventually lead to their extinction as a race if the problem is not resolved. While the Asgard maintain a large fleet of ships with defensive capabilities, as a whole they are not a militaristic race, and they strongly disapprove of the use of technology for aggressive purposes.

The Asgard have at least 3 types of ships: the Beliskner-class cruiser, the Daniel Jackson-class science vessel and the O'Neill-class battleship.

The Asgard language is considered to have influenced the formation of the Germanic languages. Their written language is runic in styling. As the Goa'uld are named primarily after figures from Earth's Egyptian and Greek mythologies, members of the Asgard race are typically named after characters from Norse mythology. Asgard's spoken language can be understood by playing the sound in reverse.
The Asgard High Council is the governing body for the race. The size and structure of the council is unknown, but there are at least seven sitting members, including Freyr, Thor, and Penigal (Red Sky). The Asgard High Council makes decisions that will affect the whole race. In addition, it enters negotiations on behalf of the Tau'ri, most notably the Protected Planets Treaty.

They gather in a large meeting hall equipped with holographic projectors.

One of the most notable occasions when the Asgard came to Earth's assistance occurred when it was learned that the Goa'uld System Lords had decided to attack Earth ("Fair Game"). The Asgard called a meeting between delegations representing the Goa'uld, the Humans and the Asgard, the purpose of which was intended to include Earth under the protection of the "Protected Planets Treaty". This treaty has served to maintain a millennia-long, if fragile, peace between the Goa'uld and the Asgard.

Attending on behalf of the Goa'uld were the System Lords Yu, Nirrti and Cronos. Thor represented the Asgard and chose Colonel Jack O'Neill to represent the Humans.

Although events did not start off well, an accommodation that satisfied all parties was eventually reached after the attempted assassination of Cronos by Nirrti.

The treaty for Earth was that the System Lords do not attack earth and any banished Goa'uld like Sokar would be driven back.


28000 B.C.

An Asgard ship, still with the Earth-human sized, but clone, Asgard, left the homeworld, and was discovered only a "few years ago". Heimdall started research on it because the clone was from a time when their cloning program was "not yet irreversible" (ie. leading to the contemporary problem of cellular degradation through reclonings).

8000 B.C.

The Asgard were part of the Alliance of four great races in the Milky Way galaxy.


For a little while, the Asgard have been making deals with the Goa'uld to leave some worlds alone. Some of these specific planets are inhabited by humans who were transplanted by the Goa'uld and some by the Asgard.

The Asgard have been largely unable to help Earth with their fight against the Goa'uld due to a war with a greater enemy, the Replicators. Asgard weapons had largely proven ineffective against Replicators because they were energy-based, which the Replicators were able to develop sophisticated technological countermeasures against. Human weapons, on the other hand, used simple chemical reactions to propel inert projectiles (ballistics) -- a crude method that proved difficult for the physically small and weak replicators to adapt to. SG-1 has provided assistance to the Asgard on several occasions. One time when Major Carter suggested flying their newest incomplete ship, the O'Neill, into hyperspace to lure the Replicators and explode. Thor make a promise that when they defeat the Replicators, the Asgard will dedicate all their resources to help defeat the Goa'uld. With the help of SG-1, the Asgard were able to lure all of the Replicators into a time-dilation field.

Unfortunately, escape was later made possible; two years later, the Replicators escaped the black hole created by the Asgard using the time-dilatation device and launched an attack on the Asgard's new home world, Orilla. An attempt to prevent this was led by Aegir attacking the ship as it emerged from hyperspace, before it could raise its shields. Not all the Replicators were destroyed, a party led by the human-form Replicator known as "Fifth" managing to land on the planet. Colonel O'Neill, with the knowledge downloaded from a Repository of the Ancients, was able to devise a weapon that permanently jammed the Replicator intercellular communications 'network', rendering all Replicators affected by this weapon unable to self-assemble and simply fall apart into their constituent components. Thor was able to engineer a larger version and thus fire a planetwide shot that would disable all replicators on Orilla.

When the Replicators turned their attention to the Milky Way, made themselves immune to the Disrupter and began to attack the Goa'uld System Lords. The Asgard could only send Thor and still they couldn't eliminate the Replicators. However the Tau'ri and Jaffa used the Dakara Superweapon to defeat them once and for all.

It is unclear what will become of the Asgard after the Replicators threat was neutralized by SG-1 and the Jaffa rebellion a year later, but it is reasonable to assume that they will focus their energy on rebuilding their civilization, along with providing further assistance to humanity. The Goa'uld have largely been defeated, but new threats have risen in form of the Wraith and the Ori. The Asgard in the season nine finale "Camelot" assisted the united attack against the invading fleet of the Ori however with little success. It appears that they will continue their commitment in their ship building efforts, as they have provided Earth's new battlecruiser, the Daedalus, with significant technological upgrades, and an Asgard engineer named Hermiod to help them understand and operate their technology. Another Asgard named Kvasir has appeared in SG1 many times and helped the SGC overcome the dilemmas encountered in the episodes "Ripple Effect" and in "Camelot". The Asgard also sent an O'Neill class battleship to the Battle of P3Y-229, which fared much better than the other ships and was not seen among the debris field and other destroyed ships. As of yet, its fate in the battle was not revealed.

30000 B.C

The Asgard were a tall humanoid species. At the time they reproduced in the same way as humans, sexually. They have since lost this capability.


Due to a decay in the Asgard's genome, they have lost the ability to reproduce sexually. They survive by cloning their bodies and transferring their minds. They look very much like the Roswell Greys with webbed hands and feet.