Before he was Ant-Man, Scott Lang was a master thief who wanted to change his ways. But he didn't expect to change his height! So when Dr. Hank Pym recruits him to wear a super-powered suit that shrinks him down to the size of an insect, he reluctantly realizes his life of breaking-and-entering is far from over. Working with Hank and his daughter, Hope, Scott must plan and execute a takedown of Darren Cross, Hank's protégé, who has become so power hungry, he's willing to sell the technology of the suit to the highest bidder. Even if that bigger is an international terrorist organization.