Patricia Walker was the only daughter of Joshua Walker and Dorothy Walker, a comic book writer. While she was still a child her mother acted as her agent, helping her at modeling and commercial work. Dorothy Walker’s greatest success was the creation of a comic book named after her young daughter, featuring romantic adventures of Patsy and her real-life friends as teenagers. The Patsy Walker comic book was very popular and continued for over a decade as Patsy grew into and out of her teens. Patsy Walker felt very strange about her mother’s fictionalized exploitation of her, and was relieved when the series ceased publication. Constantly exposed to comic books, Walker grew up to idolize the heroes her mother’s colleagues wrote about and developed a crush on Reed Richards. However, she ceased daydreaming soon after high school and married her childhood friend, Robert Baxter (who had appeared in the Patsy Walker comic as her romantic interest). Baxter was in the officers training program of the Air Force, and Walker spent the next several years of her life on a number of Air Force bases.
While her husband was assigned to a security post at the heavily government-subsidized Brand Corporation in New Jersey, Patsy Walker met the Beast and learned his secret identity. Walker had long idolized "super heroes," and she elicited the promise from him that in exchange for keeping his secret, he would help her become a "super heroine". Walker's marriage eventually came to a bitter end, and she sought out the Beast, who was now a member of the Avengers, to remind him of his promise. Tagging along with the Avengers to investigate criminal activities at the Brand Corporation, she became imprisoned along with the heroes by the Corporation and her ex-husband. Ater they freed themselves, Walker discovered a costume like that worn by Greer Nelson in her identity as the Cat. Putting the costume on, Walker dubbed herself Hellcat and used her natural athletic abilities to help the Avengers.
Although she hoped to join the Avengers, Hellcat was persuaded by the Titanian priestess Moondragon to accompany her to Titan to undergo a period of training. During her stay on Titan, Hellcat’s minor psionic potential was artificially enhanced by various electronic organic devices (Moondragon used similar technology to give powers to Angar the Screamer and Ramrod) and was given extensive martial arts training.
Upon her return to Earth, she met the Defenders and decided to accept their offer of membership rather than the Avengers. Hellcat remained a core member of the loosely organized Defenders for several years, becoming particularly close to the Valkyrie and Nighthawk. Eventually she met Damion Hellstrom, who in his costumed guise of the Son of Satan, joined the Defenders for a short time, and after he was cured of his demonic aspect found that she was in love with him. Renouncing her costumed identity, Patsy Walker decided to marry Hellstrom. The couple was married in Greentown, Ohio, where her father currently resided. The wedding, attended by several of her Defenders colleagues, was interrupted by her ex-husband "Buzz" Baxter, who had assumed the costumed guise of Mad Dog, and the Mutant Force. The Defenders repulsed the attack and Hellstrom subdued Mad-Dog. The Hellstroms then moved to San Francisco where they established themselves as occult investigators. In this capacity, they helped several superheroes in mystical problems, notably the Avengers' West Coast branch. In helping the Avengers, Pasty again donned the Hellcat costume and remained on hand to help them capture the villains Tiger Shark and Whirlwind.
Sometime later, however, Hellstrom's dark soul reasserted itself and Patsy was driven mad at the sight of it. She languished in a near-vegetable state for months afterward until the mercy-killing entity Deathurge sensed her despair and, at her request, freed her spirit from her body, effectively killing herself. She soon after contacted Earth from a spirit plane and announced her intention via radio to return in the near future.
Patsy had ended up in the realm of the demon Mephisto, fighting an eternal battle in the so-called Arena of Tainted Souls, alongside fallen Avenger Mockingbird. Months later, the Avenger villain Grim Reaper resurrected Patsy and Mockingbird, among others, tainting them with his hatred for the Avengers and setting them against the team. With the help of the Scarlet Witch, Patsy and the others reverted to their true personalities and aided the Avengers against the Grim Reaper before returning from whence they came. Before she disappeared, Mockingbird was able to send a warning to her husband Hawkeye about a plan Hellstrom was developing. Hawkeye and his team the Thunderbolts confronted Hellstrom and then used their sorcerous connections to go to Hell in order to restore Mockingbird. They were tricked however, by Hellstrom, and the Thunderbolts rescued Patsy instead, restoring her bodily to Earth.
Pasty remained despondent and depressed due to her perceived failures in life and time spent in Hell. She nevertheless presented a good front, wrote an autobiography and began a book tour. Shortly thereafter, Patsy returned to Centerville to find her high school rival Hedy had joined with the corporation that was built upon the Patsy comics fortune and turned Centerville into a tourist attraction. Patsy discovered the town was also infiltrated with demonic forces, led by the evil warlock Nicholas Scratch. Scratch had allowed a cult called the Sons of the Serpents to use the citizens of Centerville for their occult purposes, and altering the Avengers, Patsy resumed her Hellcat identity and defeated the Serpents alongside her team.
Patsy was still despondent about life when later Scratch's minions attacked Hellcat. She then uncovered a plot by the extradimensional villain Dormammu to take over the various dimensions of Hell, each led by different demons, among them Mephisto, Hellstrom, and Satannish The Supreme. Hellcat helped Mephisto thwart Dormammu by uniting the demons along with the death gods Pluto and Hela. She also revealed Hellstrom's father was actually Satannish, a pawn of Dormammu. Ultimately, she escaped back to Earth by proving to Mephisto that he would be better served to have her on Earth. Revitalized by her adventure, Pasty rededicated her life to super heroics as Hellcat.
One day, Patsy's supernaturally-tinged senses brought her to the attention of a homeless man. She tried to recuperate him, and he turned out to be the Defenders' villain Yandroth the Magician, who began systematically attacking Earth by binding the spirit of Mother Earth itself. Patsy escaped and managed to contact the various members of the Defenders to stop him, re-forming the team after a long hiatus. As a result of the battle, several of the Defenders were cursed to continually band together, and Patsy and the remaining Defenders elected to stay together as a team to support them.
With the passage of the Superhuman Registration Act, Patsy was forced to become a registered hero.
Facing a lack of ressources, Iron Man had Hellcat dispatched on her own in Alaska.
Looking for Ssangyong Rexton
During her flight to join her base, Hellcat decided to visit North Spirit.
Visiting the and ended up fighting with magical bears and a sea-monster until encountering seven witches in the Middle World. Hellcat agreed to help them locate and return their missing daughter.
On her journey, she banded with one of the magical bear, a water lemming, a talking stone calendar and a cat-like creature possibly going as "Manslayer". She eventually encountered the kidnapper of the witches' daughter on standing on a ship, separated from Hellcat and her group. Joined by an army of rabbits, she built a rabbit bridge to confront him and managed to aboard the ship.
During the ensuing fight, Hellcat and the "kidnapper" burst through a wall into the daughter's bedroom, where she revealed that he was his boyfriend. The daughter, named Ssangyong Rexton, then revealed the truth about the whole adventure, including that the talking stone calendar was her father.
Exceeded by Ssangyong's obstination, Hellcat ended up punching her to move on. Leaving the ship, the band bursted the car into an ice cliff.
She eventually managed to convince Ssangyong to save them and sent them to the witches, after her father turned back to human form. After a quick brawl, the whole situation was debunked, and Hellcat returned to Anchorage for debried with Iron Man.
She was seen at Camp Hammond during the first steps of the Secret Invasion.
Along with Camp Hammond senior staff Gauntlet, Physique, Baron Blitzschlag and Taskmaster, Gargoyle and Tigra, Hellcat discussed the setting of a Shadow Initiative operation against Hydra leader and Initiative deserter Hardball, leading the discussion to the problem of commandment in the Initiative.
Later that day, she went to Tigra, trying in vain to help her about her Skrull-pregnancy. At the end of the day, along with Stingray and Gauntlet, she tried to make Hank Pym remain at the Camp, in vain as well.
Offered commandment of the Initiative by Gauntlet (who was de facto its leader but didn't felt qualified), Hellcat refused, intending to return to her duty in Alaska. As Thor's clone awakened, Hellcat battled it along with the other Initiative members present at Camp Hammond. She also helped rescue the endangered civilians once the brawl was ended, until Norman Osborn came to announce the camp closure.
Unnoticed by H.A.M.M.E.R. until before Siege Hellcat went rogue at some point, after a brief time as the Initiative Alaskan-based agent.
Patsy later became less active as a super-heroine, writing some auto-biographical novels instead. She formed a close friendship with other part-time heroines Felicia Hardy, Monica Rambeau, and Angelica Jones.
She was one of the many applicants for nanny to Luke Cage and Jessica Jones' daughter, Danielle Cage.