Whatever life holds in store for me, I will never forget these words: "With great power comes great responsibility."
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I wanna help people. Like my dad.
~ Cassie Lang to Hope van Dyne.
So maybe you just need someone watching your back. Like a partner.
~ Cassie to her father.
Cassandra Lang, often called Cassie for short, is a fictional character in the Marvel Cinematic Universe. She appears as a supporting character in Ant-Man, Ant-Man and the Wasp, and Avengers: Endgame. She is set to return in the upcoming film, Ant-Man and the Wasp: Quantumania.
She is the daughter of Scott Lang, whom she views as a hero, even before he takes on mantle of the superhero "Ant-Man".
She is portrayed by Abby Ryder Fortson as a child, and Emma Fuhrmann in Avengers: Endgame. In the upcoming film, Ant-Man and the Wasp: Quantumania, she will be portrayed by Kathryn Newton, who also played Millie Kessler in Freaky.
Cassie was born on July 20th, 2007 and is the daughter of Scott and Maggie Lang, with the former being a petty criminal who vowed to end his life of crime to support her. Despite his vow, he was sent to jail for ending the corruption of Vistacorp. Maggie would divorce Scott while still in prison, and Jim Paxton would become Cassie's stepfather; raising her as if she was his own daughter.
Cassie would reunite with her father after he was released from prison, going to her birthday to give her a gift. She told her mother and stepfather of his arrival, who confronted him, and Scott had to leave the party, much to Cassie's dismay. Cassie would learn that her father was being hunted by the FBI, and admitted that she wanted them not to find him at dinner, being noticed by Paxton.
Cassie was later taken hostage by Darren Cross, who had lost everything to her father and his allies, Hank Pym and Hope van Dyne. She would see her father be the hero, Ant-Man, and was saved by him, as he defeated Cross by sinking him into Quantum Realm. Cassie and her family would reconcile, and Scott was finally accepted by Maggie and Paxton.
Ant-Man and the Wasp
Though Scott was put on house arrest, Cassie would visit him, and the two bond over him being a hero, and needing a partner.
Cassie survived the decimation, believing that her father had died, but he survived due to being in the Quantum Realm. Years later, Cassie would reunite with her father, who would help the Avengers stop Thanos, and undo his finger snap. After Scott and the Pym family attended Tony Stark's funeral, Cassie, Scott, and Hope spent time together at the end of the film.
Cassie shows herself to be loving, compassionate, and remained oblivious to most things like a child would. Despite her father former criminal life, she loves him dearly, and the two have a strong bond.
Cassie in the Avengers: Infinity War Prelude comic.
A teenage Cassie reunites with her father.
Cassie spending time with Scott and Hope after the Battle of Earth.
It was considered to have the character to be digitally added into Tony Stark's funeral, but the studio decided not to.