Egghead is one of only two "Batman" 1960s series villains to deduce Batman's secret identity (and the only one to do so through deductive reasoning instead of trickery). Reasoning that the enormous "egg-spense" involved in producing Batman's various gadgets would point to only one of three Gotham City millionaires, and deducing that two could not be the Caped Crusader (one has a French accent, which Batman does not have, and the other is left-handed, where as Batman is right-handed), he concludes that the last, Bruce Wayne, must be Batman.