Lord Zack's Space Opera
The Immaterium, also known by many other names, most notably the Warp, is an alternate dimension of psychic energy. Theoretically the Warp could be used for FTL travel, but most races do not consider this to be viable. This is due to the danger of Warp travel, coming from the multitude of hostile beings inhabiting the Immaterium. Furthermore, Warp travel is highly unpredictable, such that a certain time spent in the warp does not necessarily corespond to the same amount of time outside and one can even find themselves arriving before one set out. On at least one occassion the Federation has encountered travelers from a far future where humanity rules over most of the galaxy and is genocidal hostile to alien species.