When a truck crashes inside a tunnel, people on their way home for Christmas are brutally trapped in a deadly fire. With a blizzard raging outside, and the first responders struggling to get to the accident, it’s every man for himself.

A scientist awakens King Arthur and his knights, and the forces of good and evil do battle once more.

When humanity allies with a bounty hunter in pursuit of Optimus Prime, the Autobots turn to a mechanic and his family for help.