Space Nuts!
I just saw this movie for the first time in about twenty years. It holds up as the most deliriously crazy Star Wars cash-in. Relentlessly entertaining, it is of course cheesy as you would expect, but hot damn if it ain't a great slice of tasty! ...And some of the effects, though dated now, were pretty good for the time it was made. It's way better than "Space War", the other Japanese flick ripping off Lucas, and it's also much more fun than the Italian cash-ins "Star Crash" and "The Humanoid" (although I have a soft spot for the latter and its bizarre Morricone score!).
If you've not seen "Message From Space", hunt it down, go in with no expectations and you'll have a blast. With so many obscure flicks receiving special edition treatment, this mostly undiscovered/underrated gem of Jap-insanity deserves a decent release on DVD or Blu Ray.