Jack Flag

Jack Flag
Jack Flag
	Cover art to Thunderbolts #111, by Marko Djurdjevic.
Publication information
Publisher	Marvel Comics
First appearance	Captain America #434 (Dec. 1994)
Created by	Mark Gruenwald (writer); Dave Hoover (artist)
In-story information
Alter ego	Jack Harrison
Team affiliations	Guardians of the Galaxy
Partnerships	Captain America
Abilities	Skilled athlete and martial artist; Superhuman strength, stamina and durability

Jack Flag (Jack Harrison) is a superhero appearing in American comic books published by Marvel Comics. He has occasionally appeared alongside Captain America and has been a member of the Guardians of the Galaxy.

Publication history

He first appeared in Captain America #434 (Dec. 1994), and was created by Mark Gruenwald and Dave Hoover.

Fictional character biography

Jack and his brother, Drake, are members of Captain America's computer hotline network. Together, they create a citizen's patrol group in their hometown of Sandhaven, Arizona. Several criminals attack Drake, leaving him unable to use his legs. After the attack, Jack and Drake discover that the Serpent Society have infiltrated their hometown and attempt to contact the local authorities, only to learn that the Society has bribed them. Jack, unhappy with this information, begins training in martial arts and weight lifting so that he can fight the Society on his own.^[1]

During a bank robbery, Jack intervenes and battles Rock Python and Fer-de-Lance, members of the Serpent Society. Shortly after this, Jack attempts to infiltrate the Society, but King Cobra does not fully trust Jack. King Cobra sends Jack to steal a painting from Mister Hyde, who severely beats Jack. During the battle, Jack is drenched in Hyde's chemicals and develops superhuman physical abilities. Jack easily defeats Hyde and retrieves the painting. Before returning the painting to King Cobra, Jack contacts Captain America's hotline and informs them that the Society is in Sandhaven, allowing them to stop the Society.^[2]

Civil War

During the Civil War storyline, Jack Flag is shown to be living a civilian life with his girlfriend Lucy in Cleveland, Ohio, but refuses to either register or throw out his suit and weapons on the basis of the Superhuman Registration Act being "un-American". Growing frustrated with the police's slow response and lack of action about crime in his area, Flag intervenes when a woman is attacked outside his apartment building. Because of this, Flag is targeted by the Thunderbolts and arrested for violating the Superhuman Registration Act. He is attacked by Bullseye, leaving him paralyzed.^[3]^[4] Flag escapes prison with the Guardians of the Galaxy and joins the group during the "War of Kings" storyline.^[5]

Captain America: Steve Rogers

Jack Flag returns to Earth and is recruited by Steve Rogers to join S.H.I.E.L.D. and combat Hydra. He and Free Spirit aid Captain America in dealing with Baron Zemo and his "New Masters". However, Flag ignores Captain America's orders to stay with Free Spirit and goes after Zemo himself. Captain America confronts Flag and throws him off a plane, seriously injuring him and rendering him comatose. Rogers attempts to kill Flag by injecting him with poison, but Free Spirit arrives and tells him that his family decided to disconnect him from life support.^[6]^[7]

Powers and abilities

After being drenched with Mr. Hyde's chemicals, Jack Flag gained superhuman strength, stamina, and durability. He is also a martial artist and athlete.

In other media

Jack Flag makes a cameo appearance in Marvel's Guardians of the Galaxy as an inmate of the Rock prison.^[8]

References

↑ "Marvel Comics: The 15 Best Superhero Sidekicks". CBR. February 28, 2017. Retrieved August 30, 2026.
↑ Parker, John R. (December 30, 2011). "The Many Sidekicks of Captain America". ComicsAlliance. Retrieved August 30, 2026. Once part of Captain America's support network, Jack Harrison took up crimefighting in homage to the star-spangled one, and boy was he slick. He fought street crime at first, then got powers in the lamest excuse for a chemical transformation ever.
↑ Ashford, Sage (May 16, 2023). "10 Marvel Sidekicks With The Best Glow-Ups, Ranked". CBR. Retrieved August 30, 2026. The character didn't quite make it through Civil War intact, and was for a time tossed into the Negative Zone prison.
↑ Young, Kai (April 11, 2023). "10 Major Guardians Of The Galaxy Members Missing From The MCU". Screen Rant. Retrieved August 30, 2026. Sometime after being paralyzed by Bullseye, the Guardians of the Galaxy's medical staff restored his health, leading Jack to pursue a stint with the team in space, rather than resume his superhero activities on Earth.
↑ Sayne, Haiden (April 11, 2022). "10 Marvel Heroes Who Could Use Legacy Characters". CBR. Retrieved August 30, 2026. Flag was a minor player in Abnett and Lanning's classic Guardians of the Galaxy run, offering a human perspective to the cosmic oddities.
↑ Stuart, Alasdair (May 26, 2016). "Evil Captain America, DC Rebirth, and the Dubious Arms Race of Mainstream Comics". Reactor. Retrieved August 30, 2026. While extracting Doctor Erik Selvig (Hi, Stellan Skarsgård! Welcome to comics!) from the custody of Baron Zemo, Cap's life is saved by Jack Flag. He rewards the young man by apologizing and hurling Jack out of a plane to his apparent death.
↑ Donohoo, Timothy Blake (February 3, 2025). "10 Marvel Characters Who Became Dangling Plot Threads". CBR. Retrieved August 30, 2026. Jack Flag was killed in the pages of Captain America: Steve Rogers, with an injury placing him in a coma and resulting in his death.
↑ Shirey, J. Brodie (August 19, 2022). "Marvel's GOTG: Why Jack Flag Keeps Appearing On Your Ship". Screen Rant. Retrieved August 30, 2026. Flag can be spotted in a prison cell within the asteroid Nova Corps base "The Rock" during Marvel's GOTG's fifth chapter, and the player can accidentally have his pod ejected into space in an optional character interaction.

External links

Marvel.com - Marvel Universe: Jack Flag

[1] "Marvel Comics: The 15 Best Superhero Sidekicks". CBR. February 28, 2017. Retrieved August 30, 2026.

[2] Parker, John R. (December 30, 2011). "The Many Sidekicks of Captain America". ComicsAlliance. Retrieved August 30, 2026. Once part of Captain America's support network, Jack Harrison took up crimefighting in homage to the star-spangled one, and boy was he slick. He fought street crime at first, then got powers in the lamest excuse for a chemical transformation ever.

[3] Ashford, Sage (May 16, 2023). "10 Marvel Sidekicks With The Best Glow-Ups, Ranked". CBR. Retrieved August 30, 2026. The character didn't quite make it through Civil War intact, and was for a time tossed into the Negative Zone prison.

[4] Young, Kai (April 11, 2023). "10 Major Guardians Of The Galaxy Members Missing From The MCU". Screen Rant. Retrieved August 30, 2026. Sometime after being paralyzed by Bullseye, the Guardians of the Galaxy's medical staff restored his health, leading Jack to pursue a stint with the team in space, rather than resume his superhero activities on Earth.

[5] Sayne, Haiden (April 11, 2022). "10 Marvel Heroes Who Could Use Legacy Characters". CBR. Retrieved August 30, 2026. Flag was a minor player in Abnett and Lanning's classic Guardians of the Galaxy run, offering a human perspective to the cosmic oddities.

[6] Stuart, Alasdair (May 26, 2016). "Evil Captain America, DC Rebirth, and the Dubious Arms Race of Mainstream Comics". Reactor. Retrieved August 30, 2026. While extracting Doctor Erik Selvig (Hi, Stellan Skarsgård! Welcome to comics!) from the custody of Baron Zemo, Cap's life is saved by Jack Flag. He rewards the young man by apologizing and hurling Jack out of a plane to his apparent death.

[7] Donohoo, Timothy Blake (February 3, 2025). "10 Marvel Characters Who Became Dangling Plot Threads". CBR. Retrieved August 30, 2026. Jack Flag was killed in the pages of Captain America: Steve Rogers, with an injury placing him in a coma and resulting in his death.

[8] Shirey, J. Brodie (August 19, 2022). "Marvel's GOTG: Why Jack Flag Keeps Appearing On Your Ship". Screen Rant. Retrieved August 30, 2026. Flag can be spotted in a prison cell within the asteroid Nova Corps base "The Rock" during Marvel's GOTG's fifth chapter, and the player can accidentally have his pod ejected into space in an optional character interaction.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]