Paul Rudd, Evangeline Lilly and Michael Douglas star in this sci-fi action movie following the Marvel Comics superhero. Decades earlier scientist Hank Pym (Douglas) invented a special suit that would allow him to transform to the size of an ant and give him super-strength. The ageing hero approaches petty thief Scott Lang (Rudd) and, with the help of his daughter Hope van Dyne (Lilly), Hank trains him to become the new Ant-Man.

After Darren Cross (Corey Stoll) takes over his former mentor Pym's business he produces a similar suit to be worn by the military as well as a more powerful suit for himself, transforming him into Yellowjacket. This results in chaos and it's up to Ant-Man to use both his thieving skills and his new-found abilities to save the day.