The Xindi Empire was a potential future Xindi government which the Xindi-Reptilians might have someday led. It was referred to from the perspective of the 22nd century. (ENT: "The Council", "Zero Hour") Given the way the Sphere-Builders used the notion of a Xindi empire to manipulate Dolim, it is unclear if they really foresaw such a future, or just made it up. In the script of "The Council", the name of this hypothetical government was formatted as "Xindi empire". However, it was formatted as "Xindi Empire" in the script of "Zero Hour".