Batman live-action series
Egghead was a super villain introduced in the 1960s Batman TV series starring Adam West and Burt Ward where the role of Egghead was created for horror actor Vincent Price.
Egghead (real name Edgar Heed) is a megalomaniacal criminal-mastermind who has a bald misshapen head resembling an egg. Due to this he revolves all of his crimes around eggs, speaks with heavy usage of egg puns, and utilizes egg-themed weaponry such as: stinking egg bombs, radar eggs (which are, "eggsplosive"), laughing gas eggs, tear gas eggs (the eggs of chickens he exclusively fed onions),and egg of oil (an egg filled with oil).
In addition to all of this, Edgar believed himself to be the world's greatest criminal-mastermind and had his henchwoman, Miss Bacon write down everything he said into a book called How to be a better criminal. Eventually he found himself a love interest in the form of Olga, Queen of the Cossacks. Olga was an exiled royal from the nation of Bessarovia who would become his partner in crime for egg-themed capers.
Egghead was 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 would point to only one of three Gotham City millionaires who would be of the right age as Batman 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, whereas Batman is right-handed), he concluded that the last, Bruce Wayne, must be Batman.
Edgar has made very few appearances in mainstream comics. It has been shown in comics however that he is a regular inmate of Arkham Asylum.