List of Recurring Alien Characters in Stargate SG-1 - Tok'ra

The Tok'ra (literally "against Ra", the Supreme System Lord) are a faction of Goa'uld symbiotes who are opposed to the Goa'uld culturally and militarily. Spawned by the queen Egeria, they live in true symbiosis with their hosts, both beings sharing the body equally and benefitting from each other. The Tok'ra have fought the Goa'uld for thousands of years, favoring covert tactics and balancing the various System Lords against one another. Since season 2 of Stargate SG-1, the Tok'ra have become valuable allies of Earth.

• Aldwin, played by William deVry (seasons 3–5) – A Tok'ra introduced in season 3's "The Devil You Know" to aid SG-1 on a mission to rescue Jacob Carter from Sokar's prison moon Ne'tu. In season 4's "Absolute Power", Aldwin is sent to the SGC to verify via a zatarc-detecting device that Shifu is indeed the supposed Harcesis. Alwin is killed in season 5's "Summit"//"Last Stand" when Zipacna attacks the planet Revanna where Aldwin guided SG-17 through the Tok'ra base.
• Anise, played by Vanessa Angel (season 4) – A gifted scientist and historian whose human host Freya is attracted to Jack O'Neill, although the symbiote prefers Daniel Jackson. She is introduced in season 4's "Upgrades", researching the Atanik armbands on SG-1 in the hope to use the armbands' powers on a dangerous SG-1 mission to destroy Apophis' new prototype mothership. Anise is present for Tanith's introduction in "Crossroads", and assists Stargate Command in "Divide and Conquer" to uncover possible Zatarcs within the SGC ranks. She improperly diagnoses O'Neill and Carter, who unwittingly lied during the test to conceal their feelings for each other.
• Jolinar of Malkshur, played by Amanda Tapping (season 2) and Tanya Reid (season 3 as Rosha) – Tok'ra symbiote of Rosha and temporarily Samantha Carter. The symbiote is severely injured by an ash'rak, a Goa'uld assassin, and died saving her host's life.
• Martouf, played by JR Bourne (seasons 2–4, 9) – A leader in the ranks of the Tok'ra. Martouf had been the mate of Rosha, host to Jolinar, for almost a century. SG-1 first meet Martouf during their first encounter with the Tok'ra in season 2's "The Tok'ra", and since Jolinar was once blended with Samantha Carter, Martouf develops an interest in her. Some episodes later in "Serpent's Song", Martouf recommends that Apophis, who sought asylum at the SGC, should be handed over to Sokar. In the season 3 two-parter "Jolinar's Memories"/"The Devil You Know", Martouf joins SG-1 on a mission to rescue Jacob Carter, the host of the Tok'ra Selmak, from Ne'tu. They are captured and tortured, but Martouf, Selmak and SG-1 can escape when a new Tok'ra weapon destroys Ne'tu. However, Martouf is unwittingly subjected to Goa'uld mind control, turning him into a zatarc. His attempt to assassinate the President of the United States in season 4's "Divide and Conquer" ends in failure, and Carter is forced to kill him. Martouf's symbiote, Lantash, survives and is placed in a Tok'ra stasis chamber, which is destroyed in a Goa'uld attack in season 5's "Last Stand". The new SGC recruit Lieutenant Elliot blends with Lantash after a severe injury, but they give their lives to save the rest of SG-1 and the Tok'ra, eliminating the entire Goa'uld invasion force with a vial of symbiote poison. An alternate version of Martouf arrives at the SGC when many SG-1s from alternate realities start coming through the Stargate in season 9's "Ripple Effect". That universe's Martouf had joined the SGC to be closer to Carter, but their relationship did not last.
• Ren'al, played by Jennifer Calvert – A member of the Tok'ra High Council. In "Enemies", she travels to Earth to inform General Hammond that, though their plan to destroy Apophis' fleet was successful, no trace of SG-1 or Jacob/Selmak has been found. In "Summit", Ren'al briefs the SGC on an upcoming summit of the Goa'uld System Lords and the Tok'ra plan to assassinate them using symbiote poison. When the Tok'ra base on Ravenna comes under attack by Anubis' minion Zipacna in "Last Stand", Re'nal is killed by falling debris.
• Selmak, played by Joy Coghill (season 2, Saroosh) and Carmen Argenziano (seasons 2–8) – Tok'ra symbiote of Saroosh and later Jacob Carter.

Other Tok'ra seen include Garshaw of Belote and Persus.