 Jay Felger, infamous for his failed projects, and Carter begin work on a computer virus designed to disable a DHD by scrambling its symbols and corresponding coordinates. But when Daniel, O Neill and the other SG teams become stranded on other planets unable to dial home, Felger s Avenger virus seems to be doing something it wasn t designed to do: it s spreading. As the entire gate network shuts down, Felger and Carter look for a solution to repair the damage that was done.