On a future  frozen Earth  a train that never stops circumnavigates the globe. On board: all of
humanity that we could save from the great disaster that wrapped the planet in ice. At the
front of the train  the survivors live in comfort and luxury - at the rear  their lives are
worse than cattle  trapped in the squalid dark. When one of the occupants of the tail breaks
through into the main train - all hell follows in his wake!