| | Stargate SG-1 | Richard Dean Anderson as Colonel/Brigadier General Jonathan J. "Jack" O'Neill
Founding commanding officer of SG-1. Upon joining the Air Force at 18, O'Neill proved himself to be an exceptional and gifted airman and was later assigned to a Special Forces unit. He resigned from the military when his son, Charlie, died by accidentally shooting himself with O'Neill's service weapon. O'Neill was devastated by the loss, which eventually drove his wife to divorce him. He was later recalled to duty by his former commanding officer and sent through the Earth's first discovered stargate, in a mission that gave him a new desire to live. After several years of leading SG-1 through missions across the galaxy, helping to save Earth innumerable times, he was promoted to brigadier general and chief of Stargate Command. Most recently, he was appointed by President Hayes to serve as the head of the newly created federal department of Homeworld Security and promoted to the rank of major general. |
 | Amanda Tapping as Captain/Major/Lt. Colonel Samantha Carter
A specialist in stargate technology who holds a doctorate in astrophysics, Carter brings both extensive scientific knowledge and military training to the SG-1 team. When one of the earliest stargate-research projects was ended before completion and she was transferred to another base, she continued her research in private before eventually being recruited for SG-1. During her SG-1 tenure, Carter has been promoted from captain to major and most recently to lieutenant colonel. |
 | Christopher Judge as Teal'c
Alien of the species known as Jaffa. The Jaffa each carry an infant symbiote in a belly pouch. This symbiote is the larval stage of a separate, parasitic species, the Goa'uld, who use lifeforms from around the galaxy as host bodies. There is a strong symbiotic relationship between the larva and the Jaffa, because the symbiote guarantees its host long life and immunity to disease. Teal'c, however, has divested himself of his symbiote, and must now depend on the drug tretonin (a distillate of Goa'uld symbiotes) to live. Teal'c (who succeeded his mentor, Bra'tac, as First Prime of the notorious Serpent Guards of Goa'uld system lord Apophis) was forced to leave behind his son Rya'c and his now-deceased wife Drey'auc when he joined SG-1. His goal in life has been to defeat the Goa'uld, and to seek personal redemption for some of his past deeds. |
 | Michael Shanks as Dr. Daniel Jackson
A veteran of the first exploratory team from the movie Stargate, Dr. Daniel Jackson is an anthropologist, linguist and expert in ancient and current cultures; he speaks more than 20 languages, including ancient Egyptian. He had originally been contracted by the military to decipher a mysterious hieroglyphic cartouche. His subsequent translation of it allowed Earth's first discovered stargate to be opened. As a member of SG-1, Jackson's humanistic approach was often in conflict with Col. Jack O'Neill's militaristic style. |
 | Don S. Davis as Major General George S. Hammond
Founding commander of Stargate Command and all SG units. A hardened military leader and a wise man willing to do whatever is necessary to defend the interests of his country, his world, and all of humanity, he was promoted to a Pentagon position as chief of defense for Earth, a post referred to colloquially as "Head of Homeworld Security." |
 | Corin Nemec as Jonas Quinn
A scientist and dignitary from Kelowna, one of three nations on the planet Langara (original Earth designation: P9Y-4C3), Quinn was present at the accident that gave Dr. Daniel Jackson a fatal dose of radiation poisoning. Initially involved in a cover-up, Quinn later made amends by smuggling to Earth a small amount of the unstable yet powerful element Naquadria (a derivative of Naqaudah) for SGC to study in the hopes of developing shared defense technology. For his actions, his homeland initially branded Quinn a traitor. Quinn, who has a metahuman capacity for absorbing knowledge, replaced the "Ascended" Dr. Jackson on the SG-1 team. With changes in the political winds, however, his homeland and birthright called him back. His former teammates joined him afterward on a mission to save his planet from nuclear destruction. |
 | Claudia Black as Vala Mal Doran
Vala is a former Goa'uld host who now is a scheming, unscrupulous, thieving con artist. In addition to her mysterious agenda, she appears to have a more than passing amorous interest in Dr. Daniel Jackson. |
 | Ben Browder as Lieutenant Colonel Cameron Mitchell
Lt. Col. Cameron Mitchell is a gifted fighter pilot who was seriously injured while saving SG-1 in Season 7's two-part finale "The Lost City." Fully recuperated, Mitchell arrived at Stargate Command to join the team he fought so hard to save, only to find that SG-1 wasn't quite like he remembered. Now, after a year as the team's leader, he finds himself facing a galaxy of perils unlike anything he could possibly have expected. |
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