My favorite going away was "The Gunslinger". As far as I know, it was the only western they did. Favorite line: "Only the good die young [but most people are morally ambiguous which explains our random dying pattterns]".
My runner up is "I accuse my parents" followed by Pod People.
My favorite episode was 'Rocketship X-M From Mars' with Lloyd Bridges <<by this time my lungs were aching for air>>
I've got a copy of it on VHS somewhere when I recorded as many of the 24 hours of the MST3K Turkey Day marathon in '91 or '92. I wish I could find it on DVD.
And it's bad, so very bad. But there's a kind of seedy corruption to its badness that I didn't get out of stuff like "Alien from L.A." or "Pod People" or "Time Chasers".
I honestly kept waiting for "Manos" to morph easily into a snuff film.
One of my favorites was "Boggy Creek 2: And The Legend Continues". No film, before or since, has ever depicted Arkansas so accurately.
I don't remember the movie, but they kept talking about the "Paper Chase guy" who flies around in a helicopter. There's also a bald guy who plays a Dr. Evil-type character. Pretty good stuff...