[4] Cassandra Lang debuted in Marvel Premiere #47 (April 1979), created by writer David Michelinie and artist John Byrne.

[volume & issue needed] While working with the Heroes for Hire, Cassie has further adventures, accidentally activating the Super-Adaptoid and receiving horrifying visions of things to come.

[volume & issue needed] All of these adventures give Cassie a taste for the action-filled life of a superhero, but it causes her mother Peggy to take sole custody from Scott.

[volume & issue needed] As a result of Cassie being kept away from her father Scott, she grows more and more bitter toward her mother, and even more so toward her stepfather Blake Burdick.

For years, Cassie visits her father whenever possible, much to her mother and stepfather's chagrin, until the events of "Avengers Disassembled," when Scott is killed due to the actions of an insane Scarlet Witch.

Some time after her father's death, and after another confrontation with her mother and stepfather, Cassie decides to run away to Los Angeles to join the Runaways, but after seeing the "Young Avengers" on television just before leaving, she subsequently changes her plans, as she later tells Jessica Jones.

However, as the altered timeline causes several of them to disappear, Iron Lad realizes that he must return to his own time and accept the fact that he will become Kang, much to Cassie's sorrow, as she had fallen in love with him.

"[22] In the Civil War limited series, Cassie, along with her fellow Young Avengers, join Captain America's resistance to the Superhero Registration Act; she and the rest of her team stay at a safe house, while Nick Fury arranges new secret identities for them.

During this time, she participates in a rescue effort, which turns out to be a trap laid by Iron Man: during the subsequent battle, Goliath is killed by a clone of Thor and her teammate Wiccan is captured.

Afterwards, Cassie opts to leave Captain America's side and to register, citing her reasons as wishing to fight villains rather than cops and other heroes.

O'Grady makes several disparaging remarks about her father, not realizing that she is within earshot; this causes a literally giant-sized brawl between the two as both grow to their giant forms.

[30] In the aftermath of the Skrull invasion, Cassie Lang leaves the Initiative at the start of the Dark Reign storyline and rejoins the Young Avengers.

Cassie and Vision (now seemingly in a relationship) fly to the Avengers Mansion ruins, having been summoned by Wiccan with warnings of a great magical threat.

After finding their teammates turned to stone, they encounter the Scarlet Witch transporting them away to be a part of the Mighty Avengers, led by Hank Pym.

During a confrontation with the Fantastic Four for a device of the late Bill Foster, she refuses to participate in the attack and instead warns them about what was really happening, citing her reluctance to fight those she feels are like family to her.

Teaming up with the rest of the Mighty Avengers one last time, Cassie and Vision help stop the Thunderbolts from delivering Odin's Spear (an Asgardian weapon of virtually limitless power) to the Iron Patriot; in the battle, she also fights the new Ant-Man again.

[36][37] At some point, Cassie applies for a babysitter job with Jessica Jones and Luke Cage, though more in the hope of eventually finding her way into the ranks of the New Avengers rather than any dedication to babysitting itself; she is dismissed in favor of Squirrel Girl.

[38] When Wiccan's uncontrolled magical energy nearly kills several members of the Sons of the Serpent, the Avengers begin to fear that he might become another Scarlet Witch; they explain to the Young Avengers how the Scarlet Witch went insane after the loss of her twin boys, resulting in the death of the original Vision and Scott Lang, and rendering nearly all of the world's mutants powerless.

When Wiccan feels unsure about what to do, Cassie suggests that they try to find the Scarlet Witch, believing that if they can show her that her children are alive, she may be able to reverse everything she has done, including her father's death.

[40] After the Scarlet Witch is found, Dr. Doom steals her reality warping powers and fights the combined forces of the Avengers and X-Men.

As Doom seemingly kills her father (who actually managed to shrink down and escape with minor wounds), a distraught Cassie charges the super-powered dictator, gaining time for Scarlet Witch and Wiccan to prepare a joint spell to remove his new powers; however, Doom retaliates by blasting Cassie with an explosive spell, killing her.

[42] Bentley 23 (a clone of Wizard) of the Future Foundation later postulates that, due to the unstable nature of Pym Particles, Cassie's body could conceivably regenerate into an ionic form similar to the resurrection of Wonder Man; he suggests digging up the corpse to check, stating that he is sure his classmates are thinking the same thing.

[43] During the AXIS storyline, Doctor Doom is transformed into a more heroic, altruistic form as a result of the battle with the Red Skull that involved a spell that inverted heroes and villains' personalities.

While Cassie survived, not knowing herself what had happened to her, Scott was so shaken up by that experience that he decided to leave her, reasoning that he cannot risk to put her in harm's way again and that she deserves a normal and happy life he cannot provide.

Power Broker offers a deal, in which he will grant her wish if she infiltrates Cross' base to shut him down; Cassie accepts, and adopts the new codename Stinger.

[49] When Cassie finally confesses to her mother what she did, Peggy takes her to the trial, where Darren Cross in the Yellowjacket suit and his henchmen (Crossfire and Egghead) burst into the courtroom to get revenge on Scott.

[55] It was established that she and Hank Pym share an upper limit of somewhere around 250 feet (76 m) in height, and that, if she keeps her bigger dimensions for too long, Cassie will suffer from strains that will eventually force her to shrink back down.

"[64] Michele Kirichanskaya of The Mary Sue ranked Cassandra Lang 5th in their "8 Young, New Heroes the Marvel Cinematic Universe Should Focus on Next" list.

Initially a member of the Ultimates Reserves' Giant-Women squad, she was brainwashed by Thor's son Modi to battle Spider-Man but is defeated.

[88][89] In 2023, Hasbro released an action figure of Cassandra Lang, based on the MCU incarnation, as part of the Marvel Legends line.