Former engineer Scott (Paul Rudd) went to prison for robbing the rich and helping the poor. After he was released from prison, he embarked on the road of theft in order to fight for the right to visit his daughter. Unexpectedly, an accidental theft made him a new generation of "Ant-Man". The old Ant-Man Dr. Hank Pym (Michael Douglas) became his mentor, but Dr. Pym's daughter Hope (Evangeline Lilly) was not optimistic about him. However, the crisis is imminent. In order to deal with powerful enemies and save the world, Scott has to call on his gang of friends to help him complete an impossible task. The success of the mission is also the key to Scott's recovery of his daughter. Whether the loser can counterattack depends on the last blow.