Time Machine: From The Present To The Past And To Year 2500

Four friends and a time machine. From present going back in time and to the future.

Johnny having designed a time machine, wasn't aware it is working until....

"Suddenly, out of nowhere a big green flash came and they all vanished in the blink of an eye. Ashley, Karl, Johnny, and Tina suddenly found themselves on some large battlefield, but they were being dragged behind a long procession, each with their hands tied behind their backs. They were connected to each other, and other people in brown tunics, along a long trail."

Many dangers lies ahead, what are the narrow escapes?