[s10e6] Extremis · Ad-Free

The Doctor (Peter Capaldi) discovers that the "real world" he is in is actually an incredibly detailed computer simulation created by an alien race known as the Monks.

The simulation is so perfect that people only realize it is fake by attempting to generate random numbers; since computer code is pseudo-random, everyone in the simulation produces the same sequence. [S10E6] Extremis

Upon realizing he is a "simulacrum," the virtual Doctor uses his sonic sunglasses to record the entire experience and emails it to the real Doctor in the physical world as a warning of the impending invasion. The Vault & Missy The Doctor (Peter Capaldi) discovers that the "real