"Journey to the Seventh Planet" is a rather interesting take on Ray Bradbury's short "Mars is Heaven! " which appeared later in "The Martian Chronicles". having said that, it's a lot of fun in it's own strange way. it has a theme song, which is always cool for a sci-fi movie.
there are some cool monsters, the main one is the cyclopean rat thing, which our heroes battle with lasers. there's some props leftover from various other sci-fi movies, most of which will be easily recognized by genre fans.