Injustice Unlimited (INFINITY, INC. vol. 1)
Artemis' time in the DC Universe’s continuity was mostly spent as a supporting character, partnered with a band of villains called Injustice Unlimited. The group was formed by the Wizard to challenge the Infinity, Inc. team of heroes (INFINITY, INC. #34, 1987). Injustice Unlimited was intended as the "next generation" of the Injustice Society, a perpetual threat to the Justice Society of America, and comprised almost entirely former Injustice Society members' children.
As a part of Injustice Unlimited, Artemis clashed repeatedly with Infinity, Inc. but was continuously thwarted, and the team was sent to prison, from which they would escape and begin the cycle anew.
Artemis remained with various incarnations of Injustice Unlimited, a part of multiple rosters, and even began a romantic relationship with one of her fellow villains, the Icicle.
Reinvention on Earth-16 (Young Justice season 1-2, 2010-2013)
Artemis was reintroduced on the animated TV show Young Justice as a teenager posing as Green Arrow's newest sidekick, a "niece" who joined the team at Batman's behest (Young Justice season 1, episode 6, "Infiltrator").
The truth, however, came out when it was revealed that Artemis was actually the child of Sportsmaster, who’d had her mother, Paula, take the fall for him after one of his heists had gone south. As a result, Paula was sent to prison and Artemis was left in Sportsmaster's care alongside her older sister, Jade.
Sportsmaster trained his daughters rigorously, subjecting them to abuse masquerading as "tests" he claimed would hone their skills as criminals and thieves. Eventually Jade snapped and ran away, leaving Artemis to suffer alone at the hands of their father. It wasn't until Paula’s release from prison that Sportsmaster's plans crumbled. Her time in jail had caused Paula to reform entirely, and as part of her return to society, she wanted to set a straight course for her daughter.
Artemis seized the opportunity to escape and ran away, setting out to forge her own path as a hero before Batman and Green Arrow intercepted her and positioned her on the Young Justice team. During her time on the team, Artemis was forced to confront both her father and her sister, who had adopted the code name Cheshire. Both were less than impressed with her newfound heroism. During this time, a romantic relationship bloomed with Artemis’ teammate Wally West, a.k.a. Kid Flash.
The show’s second season began with a four-year time skip, revealing that in the time following season one, Artemis and Wally had retired from Young Justice and begun building a life together. This changed, however, when the team was forced to call upon Artemis once more for a deep-cover operation (Young Justice season 2, episode 7, "Depths").
After faking her own death, Artemis assumed the identity of Tigress and began working covertly with another member of her former team, Aqualad. The ruse ended after a climactic fight forced Artemis to give up her cover and return to her team—and to a confused, heartsick Kid Flash, who’d spent months believing she was dead.
Their reunion, however, proved short-lived. Wally was forced to sacrifice himself to save the world, leaving Artemis grief-stricken but more resolved than ever to fight for justice as a Super Hero. As the show’s second season ended, she took up the code name and identity of Tigress full time in order to give herself a fresh start.