When brilliant but reclusive scientist Dr. Hank Pym perfects a technology capable of shrinking living matter, he vows to keep it out of the wrong hands. But when ruthless industrialist Darren Cross and genius-turned-criminal Elihas Starr target the Pym Particles, Hank is forced to don his Ant-Man suit for the first time in years. With the help of his fearless partner Janet van Dyne, and unexpected allies like Simon Williams and rookie S.H.I.E.L.D. agent Jimmy Woo, Pym must pull off a daring heist to stop his enemies. Along the way, he realizes that even the smallest steps can change the fate of the world.