The particular cover displayed under this (Frankenstein vs. Dracula) title is not the mopvies with Lon Chaney jr. and J.Carroll Naish-a decent flick itself, but I refer you to the other reviews on that one.
This one, which appears to be mislabeled on this site, stars Michael Rennie as an alien ("Klaatu" from "The Day the Earth Stood Still"). He takes over the body of an earth scientist, and steals the bodies of Dracula, Frankenstein, The Mummy, and the Wolfman (All with changed names). Dracula and Frankenstein never lay eyes on each other, but the Wolfman takes down the Mummy and Frankenstein (after being flung around by both of them-he just gets lucky). Dracula is too wimped out for my taste (he actually gets his ass kicked by a cop-I mean literally gets his ass kicked). The alien plan to revive the great monsters to help them take over the world ends of course in disaster. All around, this is at best a B-movie, and a damn good one. They rip off scenes from older movies like "Frankenstein meets the Wolfman" and "House of Frankenstein". This is pretty fun, it's in the same series of foreign films as "Werewolf Shadow" and "Fury of the Wolfman".