When brain-swapping aliens attack New York, 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?
| Actor | Role |
|---|---|
 Peter CapaldiThe Doctor | The Doctor |
 Matt LucasNardole | Nardole |
 Justin ChatwinGrant | Grant |
 Charity WakefieldLucy | Lucy |
 Tomiwa EdunMr. Brock | Mr. Brock |
| AAleksandar JovanovićDr. Sim | Dr. Sim |
| LLogan HoffmanYoung Grant | Young Grant |
| DDaniel LorenteTeen Grant | Teen Grant |
 Sandra TelesReporter | Reporter |
 Tanroh IshidaOperator | Operator |
| VVaughn JohsephSoldier | Soldier |