Any show about a kid (or a group of kids) either trapped or voluntarily in a magical world/alternate dimension is doomed to have the characters stuck there because no one knew of closure back in the 70's and 80's. I think it was strictly enforced to keep the show on infinite reruns without having the kids get wise and stop watching.
As I know of, I didn't watch enough Kidd Video to know what their fate was at the "end" of the series.
Captain N (depending on if you want to count the truncated third season or not) either ends with Kevin getting a weird virus and having half the characters go on a "Fantastic Voyage" to save him or a standard plot about Final Fantasy, not the big epic battle with Mother Brain the show should have concluded with (heck, she only shows up once in the third season, poorly drawn to boot). And I guess Kevin stayed in Videoland to the chagrin of his parents who he's missing and presumed dead to them.
Cyberchase? Well... I think they cured Mother Board, but then they took it back, and while they set something great up with a rival for Hacker, the show just...disappeared. There were a few more episodes, but then PBS stopped really airing them. At least they could go home whenever they wanted.
Galaxy High School. It officially ends with a pretty good dream sequence episode about how everyone else moved on with their lives and Doyle's stuck as just that jock that peaked in High School, but done in such a way that it's more of an allegory (he becomes a giant for some reason after he wakes from a coma while seeing all his classmates grow up and move on to their careers). Other than that...I dunno? Aimee and Doyle graduated, maybe?
As I know of, I didn't watch enough Kidd Video to know what their fate was at the "end" of the series.
Captain N (depending on if you want to count the truncated third season or not) either ends with Kevin getting a weird virus and having half the characters go on a "Fantastic Voyage" to save him or a standard plot about Final Fantasy, not the big epic battle with Mother Brain the show should have concluded with (heck, she only shows up once in the third season, poorly drawn to boot). And I guess Kevin stayed in Videoland to the chagrin of his parents who he's missing and presumed dead to them.
Cyberchase? Well... I think they cured Mother Board, but then they took it back, and while they set something great up with a rival for Hacker, the show just...disappeared. There were a few more episodes, but then PBS stopped really airing them. At least they could go home whenever they wanted.
Galaxy High School. It officially ends with a pretty good dream sequence episode about how everyone else moved on with their lives and Doyle's stuck as just that jock that peaked in High School, but done in such a way that it's more of an allegory (he becomes a giant for some reason after he wakes from a coma while seeing all his classmates grow up and move on to their careers). Other than that...I dunno? Aimee and Doyle graduated, maybe?