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Lantash was blended for nearly two hundred years with Madoc. When he died he blended with Martouf. On Martouf's first mission as a Tok'ra operative, Jolinar of Malkshur's host Nihmat was killed and Jolinar was blended with Rosha. (RPG: "Friends and Foes: Stargate Season Two")
When Martouf was killed, the Tok'ra were able to save Lantash. However, he was still too weak to survive implantation by the time that Zipacna attacked Revanna which occurred during the Battle of Revanna and took place during March 2002. When his chamber was destroyed, Lantash made an emergency entry into Lt. Kevin Elliot. However, Lantash was still weak, and Elliot's injuries too severe. Lantash and Elliot allowed themselves to be captured, then unleashed a Goa'uld specific poison on the Jaffa guarding the Stargate. (SG1: "Summit", "Last Stand")
- In an alternate reality, Lantash and Martouf survived and maintained the relationship with Samantha Carter, although it was hard with a long-distance relationship. They therefore joined Stargate Command to be closer to her. They lived together for quite some time, until she left them for someone else. As of January 2006, they are part of SG-1 together with Janet Fraiser, Dr. Daniel Jackson and Lt. Colonel Cameron Mitchell while Samantha is home with her newborn child. (SG1: "Ripple Effect")
Lantash was originally intended to have a more prominent role in the franchise, even being considered as a character for Stargate: Atlantis by Brad Wright. However, his fate in "Last Stand" ended those plans.