Cassie Lang is the daughter of Scott Lang (aka Ant-Man) with whom she shares the same pym particles with - the same substance that enabled her father to grow and shrink in size. Cassie is a big support figure in her fathers life and has superhero aspirations developing her own scientific skills and even created technology to interact with the Qauntum Realm. After accidentally entring the into the Quantum World, where she demonstrates superpowers, as she gains the ability to shrink and grow, similar to her father. Although Cassie seeks her fathers approval she forges forward to find her own path.