This dates from the early 1980s, I think. I had a bunch of these... little comics that you would spool through a window to "watch" a cartoon. In fact, over a couple summers I made my own reel comics, although most of those were sized for a different toy (and actually, that was one of those car-drives-over-unwinding-path games, so most of those were chaotic race tracks.)

Anyway, here's Reel One of Moon Dog, "The Great Moon Robbery." (What a giveaway!)

The sad news? I can't find Reel Two.