Oops! You need to enable JavaScript in your browser to start watching. Guidance: Contains scenes of moderate threat. Disable parental controls Enable parental controls Lewis Dark Matter Series 4 - Episode 2- When the master of a college is found dead at the foot of the observatory stairs, suspicion falls on all of the staff - from senior tutors right down to the scouts. 120 mins Share this episode: Copied to clipboard Share on Facebook Share on Twitter Copy link to share