The Three Stooges parody 50's sci-fi movies in "Outer Space Jitters". Accompanying a scientist (Emil Sitka) to Sunev (Venus spelled backwards), the boys (Moe Howard, Larry Fine, Joe Besser) become reluctant heroes when they discover that the Sunevians intend to invade Earth. Look for Dan Blocker (Bonanza), credited as "Don Blocker", in a supporting role. This video was posted at The Land of Whatever a while back.
You can see that Besser (ex-The Abbott & Costello Show) was not a good fit with the team due to his hyper-sensitivity to physical violence.