The fictional universe of Star Trek represents one possible future. That future has been assembled by numerous writers over the course of 45 years, six television series, and eleven feature films. When dealing with such a long span of time, so many contributors, and the evolving nature of society, it’s only natural that elements of this universe will change, stories will contradict one another, and early ambiguities will be filled in by later treks. Yet there is a prevailing feeling that every subsequent incarnation of Star Trek must adhere to its predecessors without fail. And when it doesn’t, the deviation can set off a firestorm within fandom. Let’s take a closer look at the fine line that writers walk and at some of the moments that have been labeled “rewriting Trek.”