Captain America Steve Rogers (Chris Evans), who has gradually become accustomed to modern life, smelled the sinister smell inside SHIELD after an action. When he learned that SHIELD was secretly carrying out the "Insight Project", he was even more angry. One day, SHIELD commander Nick Farrell (Samuel L. Jackson) was attacked by a group of militants. He tried his best to hand a USB flash drive to Captain America, which contained the most important and terrifying secret of the bureau since World War II. After that, Captain America was wanted and hunted by former director Alexander Pierce (Robert Redford) for suspected murder of Nick. During his escape, he was helped by Black Widow (Scarlett Johansson) and veteran "Falcon" (Anthony Mackie). They must race against time to unlock the secrets of SHIELD and prevent the implementation of the "Insight Project"...