For the past 30 years or so I've had a memory of watching a TV show in my head - Namely the characters of a show getting trapped inside a TV set at the end of the show, and asking viewers for ideas on how they could get out of it.
That implied two things that are kind of mutually contradictory - One that it was a Saturday Morning magazine show because that's where - for the most part - that style of interactivity lived. And two that it was a fictional sci-fi/fantasy show. So I put it aside as likely conflating a couple of things in my head, because, you know. Surely a magazine show - a format that exists to showcase cartoons while doing interviews with celebs and playing pop music - isn't going to be sufficiently fantastical to trap its cast in a television?
Reading a television production blog I was linked to another blog, with a deep dive on the show Parallel 9 - This blog - and at the end, sure enough, right at the end of the first part of this deep dive: