Rod Serling's The Night Gallery:

There Aren't Any More MacBanes
(First aired: 1972)

Night Gallery was one of the most interesting series , not only for the unusual story lines and plot twists, but also for the talents that were showcased . Steven Spielburg, in his industry debut, directed the pilot episode, starring Joan Crawford. Originally an hour long, and consisting of 2-3 episodes per show, there was an occasional diversion with 2 episodes and a vignette. Each show began with "Good evening and welcome to a private showing of three paintings, displayed here for the first time.'
     'There Aren't Any More MacBanes' featured a student of sorcery who tries to get rid of his uncle, played by Joel Grey. Mark played the part of Francis, the messenger boy, appearing on-screen for approximately 20 seconds.