Scientists are running, shouting while the red lights flash overhead, just as the time portal flickers to life once, twice, three times before flaring open. The running and shouting ends abruptly. No one moves, speaks. They can only stare now, as time stands still.

It's never been used. Hasn't even been tested.

This isn't possible.

Dog emerges from the light, the simple wagon rolling along behind him. The moment he exits, the light dies, cut off by the passing of ...