Santa Clause Conquers the Martians [1964]
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(beware, there is some random high pitched beeping going on in the film. Apparently they had very filthy mouths back in 1964 cinema)
On a more serious note, I think I'll recommend
Death to the Tinman about now. Mostly because I found the writer/director's
imdb page, and am watching his
other work. Which is also good (if, you like DttT.) Death to the Tinman sets up as a prequel to the Wizard of Oz, to explain out the Tinman became a heartless man-o-metal.