Besides serving as host in every episode, Boris Karloff had roles in five different episodes.
A comic book based upon this series, "Boris Karloff's Tales of Mystery", which was also "hosted" by Karloff, ran from 1962 to 1980, more than a decade after Karloff had died.
The famous Bates Mansion (Psycho house) was featured prominently in an episode starring a very young Rip Torn.
The Munster house exterior and interior is used for one episode staring Edward Andrews.
Boris Karloff was a disappointing host for most critics, proving to be boring, not terrifying at all, and hardly entertaining, particularly when compared to Alfred Hitchcock, who excelled at these narrations. One critic even said he seemed uncomfortable. Nevertheless, after revamping the series after just eight episodes, and a change of personnel and direction, they kept Karloff, but merely for the name draw.