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Scott Edward Harris Lang, portrayed by Paul Rudd in the Marvel Cinematic Universe (MCU), is a key character known for his dual identity as Ant-Man and is based on the Marvel Comics superhero of the same name. Introduced in Ant-Man (2015), Scott is a former thief who becomes the superhero Ant-Man after acquiring a suit that allows him to shrink in size while increasing his strength. The technology was developed by Hank Pym, the original Ant-Man, who recruits Scott to help protect his legacy and the Pym Particle technology from falling into the wrong hands.

Scott's character is defined by his sense of humor, his devotion to his daughter Cassie, and his journey of redemption as he seeks to make a better life for himself and his family. Throughout the MCU, he appears in several films, including Ant-Man, Captain America: Civil War (2016), Ant-Man and the Wasp (2018), and Avengers: Endgame (2019).

In Avengers: Endgame, Scott plays a crucial role in the time heist plot, using his ability to navigate the Quantum Realm to help the Avengers gather Infinity Stones from the past. His character combines elements of a lovable everyman with the heroic qualities expected of a superhero, often providing comic relief in tense situations.

Scott Lang's journey continues to evolve, with his character being a central figure in exploring themes of family, responsibility, and heroism within the larger MCU narrative. The character's popularity has led to a sequel, Ant-Man and the Wasp: Quantumania (2023), which further explores the Quantum Realm and introduces new challenges and characters.