The Cobalt Cinema is a movie theater in the abandoned city on the Novus colony. The film 'Kontinuum' was apparently being shown there. Stargate: Continuum (2008) was a feature film following the original Stargate SG-1 (1997) series.
Greer says "What kind of city doesn't have a gun shop?" To which Volker replies "Maybe they were Canadian." This is a joke because the whole series was filmed in and around Vancouver, British Columbia, Canada. In fact, the "ruined city" is a film lot in Burnaby, BC used for numerous films and TV shows.