Electro made his first appearance in The Amazing Spider-Man #9 (Feb. 1964)
While Maxwell Dillon, an electrical engineer and lineman, was repairing a power line, a freak lightning accident caused a mutagenic change that transformed him into a living electrical capacitor. His powers were initially weak, so he spent some time stealing electrical equipment from Stark Industries to charge himself. During this time, he was approached by Magneto, who considered him a potential recruit for his Brotherhood of Evil Mutants, claiming that Dillon's power rivaled his own, but Dillon refused. The following day, Dillon was confronted by a small-time thug from whom he had been borrowing money to pay for the machinery he had needed. When the thug drew a gun on him because he had not paid back the money yet, he responded by shooting a blast of lightning through the thug's chest- the first time Dillon ever killed anybody. Soon taking the name Electro, he turned to a life of a professional criminal, his first victim being J. Jonah Jameson. Electro broke into the Daily Bugle Building and stole from Jameson's safe right in front of him. Jameson accused Spider-Man of being an alternate identity of Electro, prompting Spider-Man to prove the publisher wrong. During their first ever confrontation, Electro defeated Spider-Man using his electrically charged touch. Spider-Man eventually used a fire hose to short-circuit Electro while wearing rubber gloves to protect himself.
Electro next confronted Daredevil for the first time when trying to break into the Baxter Building. He was again defeated. Electro later joined the original Sinister Six, and was the first member of the group to fight Spider-Man, battling him at a Stark plant, when Spider-Man dodged a bolt of electricity he realized his powers had returned. Electro lost his power when the power was cut off by Spider-Man. Spider-Man got a card from him that led him to fight Kraven the Hunter. Electro attacked the Fantastic Four at the wedding of Sue Storm and Reed Richards, under the control of Doctor Doom's mind-control machine, but due to Mister Fantastic he, like the other villains, has no memory of the incident. He later recruited the second Emissaries of Evil in a plot of revenge against Daredevil for previous defeats. This group consisted of Gladiator, Stilt-Man, Leap-Frog, and the Matador.
Electro was later hired by J. Jonah Jameson to defeat Spider-Man on national television. He encountered Daredevil again in San Francisco, at which time he temporarily donned a modified costume. He then took control of a Protarian android seeking the destruction of Omega. Electro then teamed with Blizzard against Spider-Man and Daredevil. Electro then attempted to aid a band of criminals escaping the Defenders.
Electro later joined the Frightful Four. As part of the Frightful Four, he used Spider-Man as bait to trap the Fantastic Four. Subsequently, he battled the Falcon but was defeated, partly because he did not consider the Falcon to be a serious threat. Electro later learned that he can electro-statically disrupt Spider-Man's wall-crawling ability. The Chameleon and Hammerhead then sent the Shocker to try to recruit Electro into their organization. Instead, he later accepted Doctor Octopus' invitation to rejoin the Sinister Six, and battled Spider-Man.
Electro has fought Spider-Man countless times, either on his own or as part of a group such as the Sinister Six. He has also fought such other heroes as Daredevil, Fantastic Four, and the New Avengers. Despite his immense power, he has almost always been defeated, usually as a result of his foes outsmarting him or taking advantage of his weakness to water while charged.
As a result of his frequent and often embarrassing defeats, Electro tried to take over New York City's power supply in an attempt at glory and respect. Spider-Man thwarted this plan, however, and convinced Electro to quit his criminal career. When the insane Spider-Man clone Kaine started killing enemies of Spider-Man, Electro began to fear for his life and temporarily joined Mysterio's Sinister Seven, which had been formed to combat Kaine. This group was quickly disbanded, and following Kaine's subsequent disappearance, Electro returned to retirement.
Electro will make his first cinematic appearance in the live-action film [The Amazing Spider-Man 2](movie:508593) and will be portrayed by Jamie Foxx.