Hank Pym broke Scott Lang out from his cell inside a San Francisco Police Department police station by smuggling him the Ant-Man Suit and guiding him out. The following day, Pym and his daughter Hope van Dyne started training Lang through a series of trials, preparing him to steal the Yellowjacket Suit from Darren Cross at Pym Technologies. Lang infiltrated the New Avengers Facility to steal a device created by Pym that was intramural to the mission and defeated Falcon in the process.
Just when it seemed like their caper was going smoothly, Pym got an unexpected visit from Cross. Lang and van Dyne concealed themselves, as the former commanded his ants to conceal evidence of their caper. After Cross left Pym's house, he called van Dyne, announcing his intention to increase security at Pym Tech. Realizing their plan had hit a snag, Lang brought in his associates, Luis, Dave and Kurt in on the caper.
- "I always suspected you had a suit stored away somewhere, which begs the question, who is the new Ant-Man? Who is the man that my beloved mentor trusted even more than me? Scott Lang. The martyr, who took on the system and paid the price, losing his family and his only daughter in the process. Exactly your kind of guy, Hank. He escapes his jail cell without leaving any clue as to how, and then, he disappears magically, despite having no money to his name, and now he brings me the Ant-Man suit, the only thing that can rival my creation."
- ―Darren Cross
The moment Lang landed in the container that was holding the Yellowjacket suit, Cross took the suit out. Lang was stuck until he used one of his Pym Particles Disks and broke out. During the confusion of Lang's escape, Mitchell Carson escaped with the imitation Pym Particles, while being attacked by ants. Cross shot Pym before escaping with the Yellowjacket suit. van Dyne told Lang to get Cross while she took care of Pym. During Lang's escape, he was attacked by security. He was almost dead until Luis saved him. Pym and van Dyne escaped using a Shrunken Tank that Pym used as a key chain, and Pym Technologies was imploded, using the charges set by Lang.
Cross escaped to his helicopter with Lang and the ants in hot pursuit. Cross defended himself with a pistol and started shooting, one bullet hitting Ant-thony head-on, forcing Lang to ride another carpenter ant, vowing revenge. Lang clung onto the helicopter and fought Cross and his two guards. With his guards disabled, Cross donned the Yellowjacket Suit and fought against Lang. The two fought inside Cross' briefcase before the aircraft crashed into a household backyard.
Landing in the backyard, Darren Cross threatened the resident family until Scott Lang stopped Cross, and they continued their fight. Lang managed to swat Cross into a bug zapper; however, Jim Paxton appeared and electrocuted Lang, proceeding to arrest him. Cross then got zapped by the bug zapper, acting like a defibrillator, coming back to life but proceeded to Maggie Lang's House.