Stargate Atlantis: Casualties of War: SGA-7

Now for the main plot. After discovering an ancient battleground of the Wraith vs Ancient they find it inhabitted by two querelling tribes.. With ancient facilities came the possibilty of finding new weapons to battle against the Replicators.After a brief encounter with one of the tribes they find something that could use but that material comes with a price. They must help them destroy the other tribe. After some ill encounter with salvagers Teyla and Ronnon are considered dead but the peace mission between both tribes continue with the help of Weir. We also get glimpses of Lorne and Zelenka both secondary chapters. I would like to know more of Zelenka. I think he could have given a bigger part on the series. Not a major character because he couldn't defeat McKay role but nevertheless a bigger part. The end was quite good and end up the story nicely. I think it is a good addition to the main series.