If you loved The Secret of the Third Planet, try Guest from the Future
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Theyboth carry the foreign gem, playful mood tags, and they sit in Adventure / Family / Science Fiction territory. If that's the register that drew you to The Secret of the Third Planet, the second film will land in a comparable space — through a different lens.
foreign gemplayful
What Guest from the Future is
A Soviet schoolboy's science fair project goes intergalactic by accident. Kolya stumbles into the 21st century, foils some underdressed Saturnians after a mind-reading gadget, and drags the future back to 1980s Moscow with him. The film treats time travel like a minor bureaucratic infraction, which somehow makes it all work.

