Audiences across a variety of platforms - including TV series, novels, comics and movies - witness the people of Earth exploring a fictional universe using the Stargate.
Many of these populations were abandoned, often when deposits of the fictional precious mineral naquadah were exhausted, and subsequently developed their own unique societies.
[S 1] Some of these extraterrestrial human civilizations are shown to have become much more technologically advanced than those on Earth, the in-show rationale being that they never suffered the setback of the Dark Ages.
[S 2] Another example of AAD in the mythos is the creation of human populations in the Pegasus galaxy by the Ancients,[S 3] few of which are technologically advanced, as the Wraith destroy any civilization that could potentially pose a threat.
[4] Frederic Krueger analyses the use of Ancient Egyptian mythology, and concludes: "From a critical standpoint, Stargate gives the initial impression of a very confused pop-cultural salad, randomly tossed together out of the vegetable bins of sci-fi, American military triumphalism, and a lot of Orientalizing Egyptomania.
[3] Ultimately, he concludes that Stargate "serves as a neo-mythology able to re-enchant the world, to present an attractive anti-authoritarian option for identity formation and yet functionally equivalent to religion (according to traditional modern definitions) in its creationist tenet".
Angela Ndalianis examines the mythology behind Stargate SG-1, noting the way it is created by "rewriting centuries-old human mythologies—Egyptian, Norse, Aztec, Greek, Arthurian, Roman—the series takes these myths and 'reboots' them as scientific fact.
In its pilot episode "Children of the Gods", which takes place a year after the film, Stargate Command is established in response to an attack by the Goa'uld Apophis, and given the mandate to explore other worlds and obtain technologies that can be used to defend Earth.
In these productions, the Stargate functions as a plot generator, allowing the main characters to visit alien planets without the need for spaceships or any other fictional technology.
A typical Stargate measures 6.7 m (22 ft) in diameter, weighs 29,000 kg (64,000 lb),[S 9] and is made of the fictional heavy mineral "naqahdah".
They were considered humanity's predecessors, originally establishing Earth as their homeworld after they migrated to the Milky Way and having seeded multiple galaxies to allow life to evolve on uninhabited worlds.
At the time that the Stargate franchise takes place, the Ancients have long since "ascended", i.e. they shed their physical bodies and live eternally as pure energy on a higher plane of existence with an increased power and capacity for learning.
The Ancients' ascension was also used as a plot device for the departure of actor Michael Shanks (Daniel Jackson) in season 6 of Stargate SG-1.
Brad Wright and Jonathan Glassner tried to stay true to the feature film, but also wanted Stargate SG-1 to be unique in its own way.
[12] Newly encountered races or visited planets are integrated into the mythology, although plotlines of individual episodes are often new, self-standing and accessible for new audiences, giving a compelling internal coherence.
[S 14] Stargate SG-1 emphasized its present-day-Earth story frame by frequently referencing popular culture, like The X-Files and Buffy the Vampire Slayer had done before.
[14] SG-1 learns in season 1's "The Torment of Tantalus" that although most known habitable planets in the Stargate universe are populated by humans, there was once an Alliance of four great races.
Although they outwardly seem to be primitive forest-dwellers, they possess superhuman intelligence and advanced technology beyond that of the Goa'uld, including a floating city.
However, Stargate SG-1 revealed virtually nothing about the Furlings, beside making them the story backdrop of an abandoned site in season 6's "Paradise Lost".
Stargate SG-1 creators Brad Wright and Jonathan Glassner established in SG-1's 1997 pilot episode "Children of the Gods" that the film's unnamed alien race and the Goa'uld are the same.
[S 17] The Goa'uld parasite (generally referred to as a "symbiote") then takes control of its host's body and mind, while providing longevity and perfect health.
Their original hosts were the Unas (meaning "First Ones"), a race of large and primitive humanoids also native to the planet and whom SG-1 had first encountered in season 1's "Thor's Hammer".
The Goa'uld then found and ruled over Earth for thousands of years, masquerading as gods from ancient mythologies and transplanting humans throughout the galaxy to serve as slaves and hosts.
Having had good experiences with the first season of Stargate Atlantis, the producers decided to revamp the series by more than just adding new characters, new villains and new missions.
For example: Ori warships, built using conventional means while operated through the supernatural abilities of the Priors, are generally considered to be the most powerful vessels in the Stargate universe.
In SG-1's season 8 premiere "New Order", Daniel Jackson discovers the gate address to the legendary city Atlantis of Greek mythology.
Their intent is to establish diplomacy with inhabitants of the galaxy and a permanent human base in the city of Atlantis for scientific and military research and exploration.
[S 19] The pilot episode "Rising" of Stargate Atlantis establishes much of the backstory of Atlantis: The city was built by the Ancients millions of years ago, originally as a central outpost in prehistoric Antarctica, until an unexplained crisis—involving a virulent plague—forced them to relocate the city to the planet Lantea in the Pegasus Galaxy via intergalactic hyperdrive engines.
As explained in season 1's "The Defiant One", the Wraith drove the Ancients from their holdings until only Atlantis was left, defended by its powerful shield and a network of armed satellites.
[21] According to digital effects artist Bruce Woloshyn, the series' original CGI model of the city of Atlantis was over four million polygons, which was feature film in size.