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 Doctor Who episode is a mind-bending sci-fi thriller written by Steven Moffat that serves as the first part of the "Monks" trilogy. It is widely acclaimed for its complex "simulation theory" plot and for finally revealing the contents of the vault. The Simulation Reveal [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 Doctor (Peter Capaldi) discovers that the "real
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 Simulation Reveal A series of flashbacks explains