Time travel has been an essential part of Star Trek since the shows first series. The franchise has proved to be particularly good at opening up the potential of the sci-fi staple, from action adventure to moral conundrums and, in the case of Star Trek: The Next Generations Timescape, a classic sci-fi conundrum. In a franchise packed with episodes that play with time, Timescape pushed the barriers of Star Trek, challenging viewers as much as it did the shows crew.