From the short-lived Kid Super Power Hour with Shazam!, here's an adventure of the Marvel Family and the first television appearance of one of their classic foes, in "The Return of Black Adam", uploaded by Nightman1963 to YouTube:
Black Adam would eventually court Mary Marvel in a return appearance just a few weeks later, something the writers at DC must've known about, since nearly 25 years later, there would be a brief alliance between Mary & Adam, but another villain unrelated to the Marvel Family's continuity would corrupt Mary a short time after that.
The only familiar voice you hear in this story is veteran actor Barry Gordon (ex-Fish), who, like a number of others, forged a second career as a voice artist. Barry's other credits have included Jabberjaw, Teenage Mutant Ninja Turtles, & SWAT Kats: The Radical Squadron. To my knowledge, this may have been Barry's only gig for Filmation.