The Jovian Chronicles Companion is a supplement for the science-fiction game universe of the same name. As its name implies, the book is a companion volume to the main rulebook, offering additional insights and ideas on subjects that could not always be covered due to a lack of space.

The Companion contains advanced rules and specific cases for those who want to take their Jovian Chronicles characters and campaigns a step further. It also features additional background information, much of it visual in nature, and the long-awaited, complete Silhouette vehicle and weapon design systems.