Once you get over the silliness of the sci-fi proposition (which takes about halfway through episode 1), this series absolutely hooks you in. The plot is driven by very clever character dynamics, as each protagonist is impacted by the unique situation they are placed in, and in turn have an impact upon others. A really cleverly conceived, written, cast and acted sci-fi series... kind of what you'd get if you crossed "Doctor Who" with "Spooks". Five stars!