Cassandra Eleanor "Cassie" Lang is the daughter of Scott and Maggie Lang. Fascinated by the Quantum Realm, Lang invented the Quantum Satellite, which resulted in her, her father and the van Dyne family being shrunken deep into the realm, being trapped in Axia. Wishing to aid the Freedom Fighters in spite of Ant-Man's denies, she donned a suit to battle against Kang's Empire. However, Cassie and Ant-Man were captured by M.O.D.O.K. and questioned by Kang the Conqueror, who used her life as leverage for Ant-Man to retrieve the Multiversal Engine Core. Once she escaped, Cassie made a speech across Axia to motivate the oppressed citizens to revolt against Kang and his army before facing off M.O.D.O.K. and returning home with her family.