The Marvel CEO has provided an explanation of the Quantum Realm in Ant-Man 3. The film, also known as Ant-Man and the Wasp: Quantumania, has been reviewed and analyzed by various outlets, with some critics feeling that it has both overly ambitious and underwhelming elements. The movie features complex characters, including the villain Kang the Conqueror, and explores the concept of the Quantum Realm and its impact on timelines.