A runaway train, transporting deadly, toxic chemicals, is barreling down on Stanton, Pennsylvania, and proves to be unstoppable until a veteran engineer and young conductor risk their lives to try and stop it with a switch engine.

The brash James T. Kirk tries to live up to his father's legacy with Mr. Spock keeping him in check as a vengeful Romulan from the future creates black holes to destroy the Federation one planet at a time.