> It's a great visual reveal in the last moments of the film; no dialog needed.

Dialog is present and very famous, though. ("You maniacs! You blew it up!")

I’d argue that those lines were mysterious until the subsequent closing shot that functions as the visual punch line. At least ten-year-old me didn’t get the earlier hints.

The whole series of movies (well, the pre-2000 iterations) was recently free to watch on YouTube. They're all cheesy but the original one holds up reasonably well.

Feels like a movie-length version of a classic Twilight Zone episode, which makes sense, considering Rod Serling wrote the first draft of the film's script.