Armed with the astonishing ability to shrink in scale but increase in strength, master thief Scott Lang must embrace his inner hero and help his mentor, Dr. Hank Pym, protect the secret behind his spectacular Ant-Man suit from a new generation of towering threats, including the villain Yellowjacket. With the help of Hank's daughter Hope Van Dyne, Pym and Lang must plan and pull off a heist that will save the world.