The earliest Sci-fi movie I recall stars a group of people trying to escape what looks like evil balls - might be evil alien balls taking over. Something along these lines. And it is not Critters.
One particular scene stuck in my mind - the group is planning how to escape, and they look up and there's the mountains up top and you can see the power lines dropping - it's the balls (evil, or alien... no idea) coming down. If anyone recalls anything similar, let me know! Thanks.