After a guest appearance on The New Scooby-Doo Movies in 1972, cartoonist Charles Addams' Addams Family were spun off into an all-new animated series the next year, but on NBC, instead of CBS (at the time home of Scooby-Doo) or their original network, ABC.
The series then returned in 1992, following the success of the first feature film with the late Raul Julia as Gomez. Machimina Wrestling uploaded the open:
This version lasted a little bit longer than its first animated incarnation, 3 years as opposed to 2 for the NBC series. With Halloween less than 2 weeks away, you'd think Boomerang would consider airing either version, but it may be a matter of rights that prevents it from happening. I actually watched the 1992 series and found it mildly entertaining. The '73 show I didn't get to see because it led off the lineup, as I recall, and I had other commitments. Where they fouled up with the '73 series was not being able to reassemble the original cast (only Jackie Coogan & Ted Cassidy worked on the '73 show, Astin on the '92 show) after the meeting with Scooby.
Ratings: 1st series (1973): Incomplete; 2nd series (1992): B.
Updated, 3/29/12: Cartoonsintros has uploaded the open for the 1973 series!:
Edit, 7/26/13: The PSA for the US Forest Service was taken off YouTube. If/when it returns, it'll be reposted.