Zerok was a frontier world, and presumably therefore one of the Outer Planets. It was "not very modern" according to Keiller, and possibly the only remaining source of gold in the known galaxy. Shortly after the Scorpio crew stole 17 billion credits worth of the planet's gold from the Space Princess, Zerok ceded to the Federation, with all local currency invalid after seven days and all private transactions immediately illegal. (D: Gold)