Mark Gatiss is a writer and actor who co-wrote Sherlock (with Benedict Cumberpatch) and the Peter Capaldi seasons of Doctor Who. He played Mycroft, Sherlock's brother on that series.
Starting with this video, he presents a comprehensive history of horror in the movies, beginning with Universal Horror in the first video, moving on to Hammer Horror in the second, and finishing up with The Exorcist/Halloween (Michael Meyers) films in the final show.
It was the perfect series to watch leading up to Halloween. It's enlightening and has plenty of clips of the films it speaks about. It also informed me of horror movies that I've never even heard of (like The Plague of the Zombies). Recommended viewing for this Halloween season.
