One fateful night in New York City, the Doctor inadvertently causes a young boy to gain superpowers. Returning years later on the trail of the shady Harmony Shoal Institute, he finds the boy all grown up as masked superhero The Ghost.
In New York, with brain-swapping aliens poised to attack, the Doctor and Nardole link up with an investigative reporter and a mysterious masked superhero known only as the Ghost. Can the Doctor save Manhattan? And what will be revealed when we see behind the mask?