[on 'Continuum'] Time travel is a unique concept for telling stories. It opens so many opportunities, dramatically. There are paradoxes, and there's the science and the absence of science. We made a conscious decision early on that our characters are not in control of what's happening to them. They're basically pawns. [They]are part of somebody else's plan. So the mystery of whether or not they are changing time will remain open until the end of the show.