Severin was teamed with acclaimed 1950s EC Comics artist Wally Wood as inker for the premiere, followed by Severin and inker Jim Mooney in issue #2; newcomer Paty Greer co-penciling with 1940s Golden Age of Comic Books legend Bill Everett, who also inked, in issue #3; and Jim Starlin and Alan Weiss co-penciling the finale, with Frank McLaughlin inking.

Writer Tony Isabella recounted "My memory may be a bit shaky here, but I recall the Giant-Size books were approved and put on the schedule without a lot of lead time...

For several reasons, including distrust for the haphephobic Malcolm Donalbain (Tumulo's financial backer), distaste for Shirlee Bryant (his chosen subject), and Greer's own enthusiasm, Tumolo decided to let her friend undergo the treatment as well.

Tumolo then investigated further, and discovered that Donalbain had created a mind-control device and a set of cat-themed gadgets, with which he intended to make Shirlee his mindless superhuman enforcer.

Rapidly dying from the radiation's effects, Greer was offered one last hope of survival: a combination of ancient science, sorcery, and mental power that would transform her into Tigra, the Cat People's legendary half-human, half-cat warrior.

[16] Her time with the Avengers was highlighted by her saving the world from destruction by the Molecule Man single-handed, who intended to consume the planet's energy, like Galactus.

[19] There she befriended private investigator Jessica Drew,[20] and aided her on several cases, but had no better luck with modeling work there than on the East Coast and accepted an offer from the Vision to become a founding member of the Avengers' new West Coast-based team.

Tigra could now exploit the full range and ferocity of her abilities without fear of going so far that she would lose control of her actions, and she could also indulge her natural feline inclinations (such as hunting and chasing prey for enjoyment) without feeling guilty or self-conscious.

She also terminated her ongoing relationship with Hank Pym, explaining that although she no longer felt a cat-like need to seek affection at every opportunity, she had no conventional human desire to be tied down to one mate, either.

With the others, Tigra ventured into the realm of limbo to help stop Doctor Doom's mad plans to gain power at the cost of killing everyone in Britain.

[32] After returning to the team, Tigra inexplicably underwent another "inversion" and transformed into a more animal-like feline form, losing her human intellect completely and becoming a danger to her fellow Avengers.

[volume & issue needed] She was ultimately rescued and restored to her former appearance and stability by noted witch Agatha Harkness, who was an associate of the West Coast Avengers at the time.

During the fight, Iron Man was incapacitated and Tigra suffered a deep, critical stab wound to the abdomen before dispatching her attackers and making her escape.

[volume & issue needed] With the aid of a new transformation device to disguise her true identity from her fellow officers, Tigra spent some time on the New York City police force.

She appeared off and on, having a series of adventures as part of the ad hoc space-faring Avengers Infinity team in which she helps in preventing an extra-universal race from destroying all life in our universe.

Captain America kept quiet, exploiting her presence to feed disinformation to Iron Man about his team's plan to rescue imprisoned heroes later that day.

[42][43] She served as a founding instructor at Camp Hammond, the training compound for the Initiative, and resumed her romantic relationship with fellow superhero Yellowjacket,[44] unaware that he had been kidnapped and replaced by a Skrull duplicate.

[49] She later decides to leave the camp for Arkansas, planning to train Razorback, who had been replaced by a Skrull and recently returned, and was eager to take the impostor's place in the Battalion.

[53] When Norman Osborn told her that he was going to take her baby for genetic testing and that moreover he had made the Hood the chief operating officer of the Initiative, Tigra went on the run with Gauntlet despite having been offered her choice of prestige assignments as a registered hero.

Now wanted as an outlaw, she began exacting personal vengeance on members of the Hood's gang, starting by savagely attacking and beating one of the Brothers Grimm inside his home.

Tigra gave birth to what is apparently a normal Cat Person kitten during the transition between Tony Stark's administration of the Initiative and Norman Osborn's; the gestation period was a mere two months, due to her feline physiology.

[56] At the conclusion of the Siege, Tigra stated a new motivation not only to restore the good name of the Avengers, but also to ensure that her child will grow up in a safer world.

[57] Alongside Hank Pym, Quicksilver, Jocasta, Speedball and Justice, Tigra serves as part of the founding faculty of Avengers Academy, training a new generation of heroes in the traditions of the world's elite superhero team.

[64] Tigra appeared in the Fresh Start revival of the West Coast Avengers, in which she had been changed into a giant 200-Foot tall woman with her mind set in a feral state.

With the introduction serving as her birthday gift, Tigra had tears of joy that Nadia happily accepted her new brother and would be a big part in William's life.

She has pointed ears, sharper-than-normal teeth with pronounced upper and lower canines, eyes with enlarged irises and vertically slitted pupils, and retractable claws on her feet and hands instead of nails.

While working undercover in human guise, Tigra attended the New York Police Academy to investigate the decade-old murder of her husband Bill Nelson.

In addition to using her mystic talisman to change her appearance from feline to human and back, she has been shown magically summoning the Balkatar, the Cat People's designated emissary to the Earthly plane.

Strange abdicated his position as Sorcerer Supreme, the Eye of Agamotto created a vision showing the many mystic beings who were potentially worthy or capable of assuming the title.

When she became pregnant via the Skrull pretending to be Hank Pym, she carried the baby to term in two months, producing a single Cat Person son named William after her late husband.