She-Hulk

Jennifer Walters was born and raised in Los Angeles, California. She was the daughter of Sheriff Morris Walters and Elaine Banner-Walters. Growing up she was meek and mousy and had little confidence. Jen later attended UCLA (University of California, Los Angeles) where she gained her law degree. She began working as a lawyer in Los Angeles.

Jen was the also the cousin of Bruce Banner, whose house Jen used to visit during the summers of her childhood. To help him escape from his father's abuse, Jennifer and Bruce would spend hours in a public library, reading books to each other, and sometimes hiding at closing time to spend the night.

Blood Transfusion
Agents of Nicholas Trask, a crime boss who had crossed paths with Jen's father, shot and seriously wounded her on a day when her cousin Bruce was in town. She had been defending a gangster who had been double-crossed by Trask and offered to turn state's evidence, which would be sufficient to ruin Trask if the case went to trial. Bruce fended off the attackers and then broke into a doctor's office to treat her. Realizing Jennifer was going to die, Bruce gave her a transfusion of his own blood as there were no other supplies in such an emergency.

After she stabilized, he had her admitted to a local hospital. However, this came to the attention of the police, who considered Bruce a suspect in Jennifer's attack and Bruce changed into the Hulk to flee. Meanwhile, Trask's thugs attempted a second hit on Jennifer, causing the danger to activate gamma radiation particles in the transfused blood, turning her skin green and increasing her size to well over six feet. The goons were taken aback at what happened, and commented "it's some kinda she-hulk". Jennifer's voice boomed out "You called me a She-Hulk, so that's what I'll be," and trapped the thugs for the police to find. With the emergency over, she reverted to her normal size and strength.

She-Hulk
Although Jennifer was at first savage while in her She-Hulk form, she eventually gained the same intelligence that she had as the normal Jennifer Walters. She quickly came to appreciate the confidence and assertiveness that came with being the She-Hulk. For a long time, she felt more comfortable in her She-Hulk form than her human one. Trask paid off a local trucker to keep quiet about a shipment coming in from Stark Industries containing advanced technology. He had the trucker killed as well as the men turning state's evidence, laying the blame on the She-Hulk. He tried to kill Jen again but ended up killing Jill Ridge. The contents of the crates were revealed to be robotic parts to which he built a "She-Hulk Robot," but she was able to destroy it. Trask abducted Sheriff Walters, giving him more advanced weaponry from Stark Industries to kill the She-Hulk, keeping him ignorant that she was his daughter. Trask even rigged it so it would explode killing them both.

She-Hulk spotted the flaw and save herself and her father. Trask next constructed a massive earth-boring device called the "Silver Serpent" using the Stark tech. He planned to drain Roxxon Oil dry, allowing him to buy out the company. She-Hulk investigated and discovered the machine, but during the fight the drill continued to bore deep and deep in the Earth burying Trask alive.

Avengers
After a brief solo career (during which she met Hellcat), Jen joined the Avengers. This led to her being transported to Battleworld by the Beyonder and her participation in the first Secret Wars, most notable to her for sparking along-standing rivalry with the newly empowered Titania.

Fantastic Four
She temporarily replaced the Thing in the Fantastic Four after the war on Battleworld. She-Hulk was granted detached membership status with the Avengers upon joining the FF.

During her tenure with the Fantastic Four, the She-Hulk had to prevent a radiation leak in a downed S.H.I.E.L.D. Helicarrier. This radiation exposure apparently mutated Jennifer to the point that she could not transform back into her original form. But this was an agreeable turn of events for her since she preferred her She-Hulk form anyway. Shortly after that, she appeared before the Supreme Court, where she battled Titania.

Rejoining the Avengers
After the Fantastic Four, She-Hulk rejoined the Avengers following the Masters of Evil's attack on the mansion. During this tenure with the team, She-Hulk and the other members were influenced by Doctor Druid and his lover, Nebula, to appoint him chairman of the team. After Druid and Nebula were lost in space-time, She-Hulk and the two remaining members disbanded the team for a time. Jen eventually returned to the group after Captain America restarted the Avengers.