Ed Wood's masterpiece, "Plan 9 From Outer Space," has long been famous for being the "Worst Movie Ever Made." That accolade was given the film long before MST3k revealed such cinematic travesties as "Manos the hands of fate" or such bewildering directors as Coleman Francis.
Truthfully, "Plan 9" IS a bad movie, but a more accurate award would be "Most Unintentionally Entertaining Bad Movie" as all the continuity errors, low budget effects, bad dialogue, incredible plot holes, etc. come so fast and furious you'd swear someone made this film intending it to be a comedy. Sadly, no, the people involved really did intend a serious drama, they just failed every single step of the way.
As is, its a movie that's incredibly funny on its own. With RiffTrax its even funnier. Mike, Kevin and Bill do a great job, and even though I've seen the movie on its own about a dozen times, some of their jokes actually pointed out things I had missed during all those previous viewings.
Also, since you can play "Plan 9" with the commentary off, I was able to sell my previous DVD copy of the film, as the print on this DVD is very crisp, actually better than my standalone DVD.
So if you're a fan of MST3k, check it out. If you've never seen "Plan 9" before, please watch the movie WITHOUT the commentary first. You won't believe your eyes.