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Jonas Harrow is a genius surgeon, geneticist, cyberneticist and machinesmith.
Requires medication for a heart condition.
Over two decades ago, Jonas Harrow was disgraced for unorthodox experiments. Happening upon a near-dead criminal, Harrow, entertaining hulf-hearted hopes of redemption, cybernetically restored the criminal, who became the gangster Hammerhead. Harrow slid deeper into underworld research eventually seeking mind-controlling technology.
In recent years, Harrow enhanced criminals to superhuman status for a fee, the hapless Megawatt his first known subject. When Hammerhead rose to porminence, Harrow observed his ex-patient's battles with Spider-Man, whom he perceived as a challenge. He enhanced another criminal, the mutant Kangaroo (Frank Olver), who ungratefully scorned Harrow's schemes. Harrow continued providing services to villains like Living Laser. but when Will o' the Wisp sought removal of his power, Harrow implanted a surgical device to extort him into theft.
When the Wisp revelled while fighting the intervening Spider-Man, Harrow's device temporarily disspated him. Using stolen information, Harrow developed a "variator ray" to control human emotion. By now obsessed with Spider-Man, he tested the device on the hero's self-appointed enemy, Daily Bugle publisher J. Jonah Jameson, whom he drove to a nervious breakdown. Gloating, Harrow widened the ray's range to the victims, and he located and destroyed the ray. Undaunted, Harrow dared Spider-Man to confront him, but was defeated with one punch. Sentenced to Ryker's Island Prison, Harrow learned that inmate Armand DuBroyh was blackmailing Warden Percy Rue into allowing DuBroth's use of the prison a base of criminal activities, including the release of select super-villains. Harrow became the latest beneficiary of DuBroth's scheme, but Spider-Man exposed the operation. Harrow went unheard for for years, although some incorrectly suspected him of being the Hobgoblin.
Harrow accepted a Roxxon Oil contract to create synrhetic automated soldiers; to this end, he again extoted industrial crimes from Will O'The Wisp. Surreptitiously seeking Spider-Man's help, the Wisp instead encounterd the hero's clone Ben Reilly, who removed Harrow's implant when the Wisp assumed intangible form, but not before Harrow forced his catsoaw to release Dragon Man from custody. When Harrow remotely guided the powerful android to him, Reilly and the Wisp followed and destroyed Harrow's base.
Evading capture, studied Dragon Man in a subterrenean facility, but a subwat attack by the vampiric Bonham and his followers accidentally released Harrow's charge, which crased into the battle Bonham's forces waged against She-Hulk and the Thing. Exposed during the frat and arrested, Harrow was soon at liberty, distributing advanced weapons on the black market to finance new and inhumane experiments. Experiencing chest pains, Harrow phoned for emergency medical assistance before collapsing, but the robots and cyborgs that defended his facility drove off rescuers. Recruited to penetrate the defenses, Iron Fist escorted the stricken scientist to treatment and re-arrest.
First Appearance: The Amazing Spider-Man (1963) #114
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All-New Official Handbook of the Marvel Universe A to Z (2006)
Avengers Unconquered (2009)
#28 Die Spinne (1980)
- 'Fall Of The Avengers!'#29
- 'No Way Out!'
#233 Hämähäkkimies / Spider-Man (1980)
- 'Maximum Carnage - Gnadenlos'
Hammerhead: Death of a Wise Guy (2008)
#1 House of M: Avengers (2008)
- 'Death of a Wise Guy'
Marvel Knights Double Shot (2002)
New Avengers (2005)
Spider-Man Unlimited (1993)
Spider-Man: Hobgoblin Lives (1997)
The Amazing Spider-Man (1963)
#114 The Amazing Spider-Man: Extra! (2008)
- 'Gang War, Shmang War! What I Want To Know Is... Who The Heck Is Hammerhead?'#126
- 'The Kangaroo Bounces Back!'#168
- 'Murder On The Wind!'#202
- 'One For Those Long Gone!'#204
- 'The Black Cat Always Lands On Her Feet!'#206
- 'A Method In His Madness'#219
- 'Peter Parker, Criminal!'
The Exploits of Spider-Man (1992)
The Spectacular Spider-Man (1976)
Thing/She-Hulk: The Long Night (2002)
Hood's Criminal Syndicate
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