Ideally X would be for Roger Corman's The Man with the X-Ray Eyes but those who've graduated from Sesame Street know why it can't be. Instead X is for the Robert Greenwald mash-up of 50's and 80's that's even more ridiculous than the prospect of a Greek Muse inspiring anyone to build a roller rink. Trailer below.
Most certainly the most fantastical film Gene Kelly's ever made. If you give it the time of day you might just enjoy it.