Can someone out there who knows how to edit Wikipedia give us a hand with this? It's on their page about the animated series Thundarr the Barbarian, which I worked on. There, it presently says — but won't for long because one of you will correct this —
Twenty-one half-hour episodes were produced by Ruby-Spears Productions, an animation house formed by former Hanna-Barbera head writers Joe Ruby and Ken Spears, from October 1980 to September 1982. Despite high ratings, the show was cancelled, possibly due to the violent content.
Here, as I explained in this post some time ago here, is the correct explanation…
The ratings would have justified another but that was the period when someone at Paramount decided they wanted cartoons on Saturday AM based on Garry Marshall's hit prime-time sitcoms. This was back when if Mr. Marshall had said, "I want all the ABC executives dancing naked on my lawn and I want them there in ten minutes," they'd have all been there and nude in five. Thundarr had to be yanked to make room for one of them.
Also, I would say it had "decent ratings," not "high ratings" and I don't think Gerry Conway worked on the series. Thank you.
UPDATE, A BIT LATER: I screwed up the explanation above. It has been corrected. Sorry.