From 1984's Hyperspace AKA Gremloids, featuring Paula Poundstone, Chris Elliott (not in video clip, booo), pew pew pews, and C-3PO's cereal.
Because of a small navigation mistake Lord Buckethead lands on earth instead of "in a galaxy far, far away". But he is still looking for the princess and the secret transmissions.
I need to see this whole movie someday. Apparently the embedded clip is all the Internet currently has on this one.