13 episodes - and, IMHO, the unofficial test run for the feature film, Robin Hood: Men in Tights. Had this been released in the 60s it'd likely have run 2-3 seasons. In the mid 70s people just didn't seem to want this type of silly period comedy - bummer.
The Tick - absolutely! That one, as well as Amazon's recent version, deserved more seasons. In that 2001 attempt, Patrick Warburton was very good in the role and the supporting cast/characters were also quite good. I played the series for my grandson when he was ~14. He, too, wanted more and...
I think the 3rd season of ST:TOS gets a bad rap. While it had its fair share of lesser episodes it also had some of the best of the series.
Same here - I, too, enjoy "Spock's Brain" and consider "The Way to Eden" to be one of the true stinkers of the entire series - along with "Miri" and "The...
I went through my collection looking for others I feel could have benefited from another season or two:
Birds of Prey
Bob
Eerie Indiana
Greatest American Hero
Zorro (Disney)
Smothers Brothers Comedy Hour (heck, I'd be happy to get S1-S3 complete and uncut on DVD - those 2 Best Of releases are...
The Adventures of Brisco County Jr. - (Fox casualty) absolutely would have liked another season or three from this one. Jack of All Trades, too. Fun stuff that ended too soon.
After rewatching it a few times I think I could also go for a few more for Cleopatra 2525 (it aired in syndication...
OK... just how could I forget to mention The Green Hornet, The Time Tunnel (man how I hated it when that one didn't return), Jonny Quest, and especially Star Trek!?!
Taking the animated shows into account I'd also have to say The Jetsons - the original series - not that horrid attempt to...