Stargate SG1 - The First Ones

We finally make it to Kerri's favorite episode with The First Ones! You also gotta give it up to Dion Johnstone for his portrayal of Chaka in this episode cos he knocked it out of the park. (But he does seem to be bad luck for SG-11…) If anybody out there might know why Jack calls for Sierra Gulf One One Niner when he's trying to get ahold of SG-11, please let us know why Jack says niner. Because we are confused. This episode also opens up a lot of questions about how exactly the goa'uld evolved from this state to the god-imitating, galaxy-dominating megalomaniacs. What is the plural of Unas?