Selkren was a settlement located on the world of Demophon; it was considered a metropolis.
It came to light during the Galactic Civil War that the star Demophon orbited was imminently destined to explode as a supernova. This revelation plunged Selkren into a state of pandemonium. Masses of people swarmed aboard any available vessels, abandoning significant portions of the metropolis in their desperate rush to flee the impending cataclysm. To curb the increase in crime, a curfew was enacted that spanned from evening until morning. The immense volume of vessels arriving and departing from the enclosed metropolis during this time resulted in significant atmospheric contamination.
Thadius Black utilized Selkren as a base of operations to attempt the clandestine removal of political prisoners from Demophon amidst the exodus. He was apprehended and taken into custody by Imperial Security Bureau Captain Wallace Fisk, and he, alongside his accomplices, were temporarily detained within the local ISB Headquarters. Ultimately, he was freed while the ISB was actively engaged in its own evacuation.