Ant-Man Scott Lang (Paul Rudd) was punished by the FBI for standing on Captain America's side in the "Civil War". With only a few days left before true freedom, trouble came knocking on the door. It turns out that the first-generation Ant-Man Hank Pym (Michael Douglas) discovered through research that his wife, the Wasp (Michelle Pfeiffer), must still be alive in the quantum realm, and Scott is the only hope to bring his wife back to the real world. Without further ado, Hank's daughter Hope (Evangeline Lilly Nicole Lilly) took Scott out of the room. Soon thereafter, they not only had to avoid the entanglement of the FBI, but also had to guard against attacks from mysterious forces, and the appearance of the "Ghost" brought Scott and others into unprecedented chaos. Can Scott successfully gain freedom? Is the first-generation Wasp still alive somewhere in the quantum realm?