Super-Hero partners Scott Lang and Hope van Dyne, along with with Hope’s parents Janet van Dyne and Hank Pym, and Scott’s daughter Cassie Lang, find themselves exploring the Quantum Realm, interacting with strange new creatures and embarking on an adventure that will push them beyond the limits of what they thought possible.

As Scott Lang awaits expiration of his term of house detention, Hope van Dyne and Dr. Hank Pym involve him in a scheme to rescue Mrs. van Dyne from the micro-universe into which she has fallen, while two groups of schemers converge on them with intentions of stealing Dr. Pym’s inventions.