Real Name: Jack Harrison
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Jack has superhuman strength, stamina and durability. He once used a boom box which fired entangling rockets and disorienting fireworks.
Jack and his brother, Drake, were members of Captain America's computer hotline network and they created a citizen's patrol group in their hometown, Sandhaven, Arizona. Drake was attacked by a couple of criminals and the attack left him unable to use his legs. After the attack, Jack and Drake discovered that the Serpent Society had infiltrated his hometown and they had attempted to contact the local authorities, but the Serpent Society had paid them all off. Jack was unhappy with this information so he began training in the martial arts and weight lifting so that he could fight the Serpent Society himself. He took on a disguise that he thought would make Captain America proud and began to fight crime as Jack Flag.
During a bank robbery, Jack intervened and stopped Rock Python and Fer-de-Lance (both of whom were members of the Serpent Society). Shortly after this, Jack attempted to infiltrate the Society, but King Cobra did not fully trust Flag. King Cobra sent him to rob a painting from Mr. Hyde, who severely beat Jack. While fighting, Flag was drenched in Hyde's chemicals and developed superhuman strength. After receiving his new powers, Flag easily defeated Mr. Hyde and retrieved the painting that he was supposed to steal for the Serpent Society. Before returning the painting to the King Cobra, Flag contacted Captain America's hotline and informed them that the Serpent Society was in Sandhaven. Impressed that he was able to defeat Mr. Hyde, Cobra tried out Jack as a new King Cobra. While Flag was undercover with the Serpent Society, Captain America, and his protégé, Free Spirit, showed up to aid Jack and defeat the Society. Jack followed Captain America and Free Spirit east, aiding them against ULTIMATUM, AIM, and Madcap. When Captain America believed he was dying, he charged Jack, Free Spirit, Fabian Stankowicz and Zach Moonhunter with maintaining his hotline.
Jack Flag is later seen helping a girl escape a group of gangbangers and is targeted by the new Thunderbolts for violating the Superhuman Registration Act. He is able to subdue almost all of the Thunderbolts team, but is then stabbed in the spine by Bullseye while escaping, destroying his cauda equina and leaving him evidently paralyzed. He is then taken into custody.
First Appearance: Captain America (1968) #434
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All-New Official Handbook of the Marvel Universe A to Z (2006)
Captain America (1968)
#434 Civil War: Battle Damage Report (2007)
- 'Snake Bites'#435
- 'Snake, Battle and Toll'#436
- 'Everybody Hurts Sometime'#437
- 'If I Should Die Before I Wake...'#438
- 'The Bombs Bursting In Air'#439
- 'O'er the Ramparts We Watched'#440
- 'Dawn's Early Light'#441
- 'Through the Perilous Fight'#442
- 'Broad Stripes and White Stars'#443
- 'Twilight's Last Gleaming'
Guardians of the Galaxy (2008)
#9 Heroic Age: Heroes (2010)
- 'Prison Break'#10
- 'To The Death'#15
- 'Knowhere To Run To'#16
- 'Earth, Overcome'#18
- 'Other Worlds, Other Wars'#19
- 'Seconds Out'#20
- 'Fault Lines'#21#22
- 'Happy Birthday'#23#24#25
Official Handbook of the Marvel Universe A to Z (2008)
Realm of Kings (2010)
#1 Thanos Sourcebook (2010)
- 'The Stars Are Wrong'
The Avengers (1963)
#387 The Thanos Imperative (2010)
- 'Island of Spirits'#388
- 'Into the Breach'
- 'Faith In Monsters Part 1'#111
- 'Faith In Monsters Part 2'
Guardians Of The Galaxy
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