This is a one-episode story that doesn't have the Doctor or the crew in it, and which is a missing story. So a couple of years ago the University of Central Lancashire's film department did a recreation, using the same methods as were done back in the day.
This is also a prequel to an upcoming 12-episode epic story, so required viewing for any classic Doctor Who fan.
What did we think of the story and the recreation? Only one way to find out!
YouTube: University of Central Lancashire recreation
YouTube: Making of University of Central Lancashire recreation