Newhart, as everyone else has said, was great.
But in addition, I have a very fond spot in my heart for the final episode or two of the first or second season of Land of the Lost, which was due to be cancelled. Niven, Gerrold, um…Vonda McIntyre(?) and a bunch of other SF types were involved and given a pretty free hand.
First it’s determined that they’re not in the past, they’re in a parallel dimension or a time loop or…something. But not the past because, y’know dinosaurs didn’t co-exist with Ramapithicus (or whatever th’ hell Chakka’s people were).
Anyway, Enoch the super-evolved future Sleestack is screwing with the ancient Pylons to try to get everyone out of the time trap but determines that there’s some sort of weird “conservation of energy” thing going on with Marshall, Will and Holly. Their entrance into this dimension unbalanced things, and unless three new people are brought in, they can’t leave. And until they leave, Enoch can’t go home.
Also, there’s some funky time paradox going on: as he looks through the time-portal, all he can see is the three humans going over the waterfall in the scene from the opening credits…only their ending up dead.
Finally, in the last episode, about half way through, Marshall suggests that the way to balance things AND resolve the paradox is to bring their past selves into the Land. Enoch does, the three humans go home, Enoch goes home and the last half of the episode is the first few minutes of the first episode as the humans wake up in the Land.
As a 12 year old it blew my mind. I was stunned by how involved and complex it was.
Why the hell doesn’t someone release the whole first season on DVD, dammit!
Fenris