I saw this on twitter. For those not a million years old like me, The Electric Company was one of the PBS educational shows that ran in tandum with Seasame Street. Morgan was part of the cast, probably best known as Easy Reader. Anyway, here's an article with a bunch of segments with Morgan as Dracula, including his run in with Spiderman.
http://www.dreadcentral.com/news/235082/spider-man-vs-dracula-starring-morgan-freeman/