[s10e6] Extremis Here

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.

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. [S10E6] Extremis

A series of flashbacks explains how the Doctor ended up guarding the mysterious vault under St. Luke's University: Doctor Who S10E6: Extremis - FilmInk The simulation is so perfect that people only