Quoted from Wikipedia, Ant-Man is a 2015 American superhero film based on the Marvel Comics characters of the same name: Scott Lang and Hank Pym. Produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures, it is the 12th film in the Marvel Cinematic Universe (MCU). The film was directed by Peyton Reed from a screenplay by the writing teams of Edgar Wright and Joe Cornish, and Adam McKay and Paul Rudd. It stars Rudd as Scott Lang / Ant-Man alongside Evangeline Lilly, Corey Stoll, Bobby Cannavale, Michael Peña, Tip "T.I." Harris, Anthony Mackie, Wood Harris, Judy Greer, David Dastmalchian, and Michael Douglas as Hank Pym. In the film, Lang must help defend Pym's Ant-Man shrinking technology and plot a heist with worldwide ramifications.
Development of Ant-Man began in April 2006 with the hiring of Wright to direct and co-write with Cornish. By April 2011, Wright and Cornish had completed three drafts of the script and Wright shot test footage for the film in July 2012. Pre-production began in October 2013 after being put on hold so that Wright could complete The World's End. Casting began in December 2013, with the hiring of Rudd to play Lang. In May 2014, Wright left the project citing creative differences, though he still received screenplay and story credits with Cornish as well as an executive producer credit. The following month, Reed was brought in to replace Wright, while McKay was hired to contribute to the script with Rudd. Filming took place between August and December 2014 in San Francisco and Metro Atlanta.
Ant-Man held its world premiere in Los Angeles on June 29, 2015, and was released in the United States on July 17, as the last film in Phase Two of the MCU. It grossed more than $519 million worldwide and received positive reviews from critics, who generally welcomed the film's smaller stakes than other MCU films, as well as its cast (particularly Rudd, Peña, Lilly, and Douglas), humor, and visual effects. A sequel, Ant-Man and the Wasp, was released in 2018. A third film is in development for a potential 2022 release.
In 1989, scientist Hank Pym resigns from S.H.I.E.L.D. after discovering their attempt to replicate his Ant-Man shrinking technology. Believing the technology would be dangerous if replicated, Pym vows to hide it for as long as he lives.
In the present day, Pym's estranged daughter, Hope van Dyne, and former protégé, Darren Cross, have forced him out of his company, Pym Technologies. Cross is close to perfecting a shrinking suit of his own, the Yellowjacket, which horrifies Pym.
Upon his release from prison, well-meaning thief Scott Lang moves in with his old cellmate, Luis. Lang visits his daughter Cassie unannounced and is chastised by his former wife Maggie and her police-detective fiancé, Paxton, for not providing child support. Unable to hold down a job because of his criminal record, Lang agrees to join Luis' crew and commit a burglary. Lang breaks into a house and cracks its safe, but only finds what he believes to be an old motorcycle suit, which he takes home. After trying the suit on, Lang accidentally shrinks himself to the size of an insect. Terrified by the experience, he returns the suit to the house, but is arrested on the way out. Pym, the homeowner, visits Lang in jail and smuggles the suit into his cell to help him break out.
Pym, who manipulated Lang through an unknowing Luis into stealing the suit as a test, wants Lang to become the new Ant-Man to steal the Yellowjacket from Cross. Having been spying on Cross after discovering his intentions, Van Dyne and Pym train Lang to fight and to control ants. While Van Dyne harbors resentment towards Pym about her mother Janet's death, he reveals that Janet, known as the Wasp, disappeared into a subatomic quantum realm while disabling a Soviet nuclear missile. Pym warns Lang that he could suffer a similar fate if he overrides his suit's regulator. They send him to steal a device that will aid their heist from the Avengers' headquarters, where he briefly fights Sam Wilson.
Cross perfects the Yellowjacket and hosts an unveiling ceremony at Pym Technologies' headquarters. Lang, along with his crew and a swarm of flying ants, infiltrates the building during the event, sabotages the company's servers, and plants explosives. When he attempts to steal the Yellowjacket, he, along with Pym and Van Dyne, are captured by Cross, who intends to sell both the Yellowjacket and Ant-Man suits to Hydra. Lang breaks free and he and Van Dyne dispatch most of the Hydra agents, though one flees with a vial of Cross' particles and Pym is shot. Lang pursues Cross, while the explosives detonate, imploding the building as Pym and Van Dyne escape.
Cross dons the Yellowjacket and attacks Lang before Lang is arrested by Paxton. Cross takes Cassie hostage to lure Lang into another fight. Lang overrides the regulator and shrinks to subatomic size to penetrate Cross' suit and sabotage it to shrink uncontrollably, presumably killing Cross. Lang disappears into the quantum realm but manages to reverse the effects and returns to the macroscopic world. Out of gratitude for Lang's heroism, Paxton covers for Lang to keep him out of prison. Seeing that Lang survived and returned from the quantum realm, Pym wonders if his wife is alive as well. Later, Lang meets up with Luis, who tells him that Wilson is looking for him.
In a mid-credits scene, Pym shows Van Dyne a new Wasp prototype suit and offers it to her. In a post-credits scene, Wilson and Steve Rogers have Bucky Barnes in their custody. Unable to contact Tony Stark because of "the accords", Wilson mentions that he knows someone who can help.
