TIL - The Jetsons was originally cancelled after only one season, and instead, ABC re-tooled the show as a Sci-Fi partridge family spin-off (Partridge Family, 2200 AD).

https://en.wikipedia.org/wiki/The_Jetsons

https://www.reddit.com/r/todayilearned/comments/15qa77n/til_the_jetsons_was_originally_cancelled_after/