World on a Wire (Welt am Draht) - Season 1, Episode 02: Teil 2
Trailer
Somewhere in the future there is a computer project called Simulacron one of which is able to simulate a full featured reality, when suddenly project leader Henry Vollmer dies. His successor Dr. Fred Stiller experiences odd phenomena. A good friend, Guenther Lause, disappears in the middle of a conversation and a week later nobody has ever heard of him.