Probably the lost episode of Sesame Street where Margaret Hamilton appears as the Wicked Witch from 1976. Both Sesame Street and Wizard of Oz have a huge impact on many people's childhood so it would be great to finally get that out there after disappearing for 40+ years.
Last March, I said an episode of Hocus Focus, and now an episode has recently been found and another should be on the way. While I'd like to see more, I'm ready to move on. The one show from Nickelodeon's inaugural lineup that doesn't have any footage online is Nickel Flicks. Unfortunately, getting footage pretty unlikely because it aired at a time when not a lot of people had cable (and even not a lot that did had Nick because this was 1979) or VCRs, and the show's star, John Moschitta Jr. lost his tapes (they might still be out there somewhere, but I wouldn't know where to look and whoever would have them probably doesn't know what they have). As far as stuff that actually has a chance of happening goes, I'd like to see the one Adventures of the Little Koala episode that isn't online in English (Eucalyptus Rocket/Penguins Don't Fly). I saw both segments in Arabic recently, but I'd like to see them in English.
I Want Sprout's The Good Night Show to be found in it's entirety, but what i want found the most is Season 2 from summer/fall 2006 with Noel Macneal "Leo" as host, season 4 that aired from 2009-2011 because that season was airing when i watched the sprout channel and the season i have the most attachment to, and seasons 5/6 because i watched a few episodes that got found and the you & me tree setting is just amazing
Probably the worst choice for me but given that, I'll go with the short-lived 1990s sitcom Kirk starring Kirk Cameron since as much as the show is as ridiculous as his Saving Christmas film, I do remember watching it back in the day so might see it again for nostalgic sake so here's how dumb this show is (probably the only thing I could find in YT that's not a promo)...
It sounds like a beautiful disasterpiece. Sign me up if anything else resurfaces.