Callisto was terraformed in the 21st century, though only barely, as it was a cold and desolate natural satellite. Existing on the outskirts of inhabited space, Callisto had become a refuge for illegal groups and trades, and the population was almost entirely male. As such, there were also very few families or children.
The moon underwent a financial depression in 2071.
The city on Callisto seems to be mainly Russian, or at least influenced by Russian culture, as most of the street signs are written in Russian. The people on Callisto often wear parkas and ushankas, and the climate is cold and snowy, all images often associated with Russia.
The name "Valhalla Basin" could be seen on the map Spike views on his ship. It wasn't clear whether it was part of Blue Crow or a different area.