Rrk Ssk'kaa was a male K'kaan and the Senior Defenseman of his people on the planet Makkahn Ahk. As such, he was considered to be one of the best field representatives and was generally given task of being the leading member of any contact teams which were sent through the Stargate to other worlds. Throughout his entire life, he desired to promote the cause of his people against their Goa'uld enemies and he had personally studied the enemy extensively. Rather than simply protecting his own people, however, he was known to help in the protection of other cultures as well and was one of the few K'kaan who advocated more open actions against the Goa'uld among his people. Nevertheless, he never went against his people's official policy to simply gather information on the enemy and fulfilled this duty to the letter. (RPG: "First Steps: The Stargate Unexplored Worlds Roleplaying Sourcebook")

During one of his team's off world missions, one of Rrk's team members was snared in a primitive people's snares where it was captured by a group of warriors from a nearby settlement. Though his team mate was able to take down several of the warriors with a K'kaan stunner, he was unable to hold them off in order to be rescued by Rrk. As the team mate was being dragged away, their stealth field belt fell off and Rrk was able to find it and used it for the next few weeks as he lived off the land, waiting for a chance to rescue his team mate. It was not until the arrival of an SG team, however, that he would get his chance. After the SG team discovered the captured K'kaan—and spotting that his clothing was obviously more advanced than the natives—they freed him and were in the process of taking him to the Stargate when they were ambused by Rrk. Rrk suspected the SG team to be Goa'uld, as he had never heard of the Tau'ri or seen Humans sporting advanced technology. (RPG: "First Steps: The Stargate Unexplored Worlds Roleplaying Sourcebook")