A dangerously charming, intensely obsessive young man goes to extreme measures to insert himself into the lives of those he is transfixed by.

Julia becomes worried about her boyfriend Holt when he explores the dark urban legend of a mysterious videotape said to kill the watcher seven days after viewing. She sacrifices herself to save her boyfriend and in doing so makes a horrifying discovery: there is a "movie within the movie" that no one has ever seen before.

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, Doctor Hank Pym, protect the secret behind his spectacular Ant-Man suit from a new generation of towering threats. Against seemingly insurmountable obstacles, Pym and Lang must plan and pull off a heist that will save the world.