lightnings weakness is water or ground Ground does not get hurt by any electric powers Water weakens lightnings.
Griffin is the main antagonist in the novel The Invisible Man and its following adaptations. He creates a potion that can make him invisible, but in the cost of losing his sanity.
I liked it a lot and feel it's highly underrated. Max, aka Electro, is based on the narrator in Ralph Ellison's Invisible Man novel. There's a great review by Walter Chaw of the film that highlights the overt and more subtle references to that novel in the film, and you can read it here -- Review -- The Amazing Spider-Man 2.