Five Earths, All in a Row

Five Earths, All in a Row is a setting concept that first appeared in spacebattles forums and were added to the Steve Jackson forums.

The general concept is that thanks to ASBs five very different Earths can access each other (and their respective solar systems) via space travel and these same forces caused psionic "constructs" and "spirits" to start manifesting themslevs making some forms of impossible technology viable (FTL still doesn't work however)