Spence Leffbruk, a human male and hyperspace [prospector], existed in the time of the High Republic Era. Following the death of his wife, Spence brought up their son, Dass, aboard his starship, known as the Silverstreak. Approximately around 382 BBY, Spence and Dass found themselves marooned on the devastated planet Gloam by another prospector, Radicaz Dobbs. This occurred after they had collaborated to discover a hyperspace route to a paradise planet, an endeavor that resulted in damage to the Leffbruks' vessel.