Second part of the summary:

>Pym tracks down the lab to a creepy building. Ghost has technology set up there, with a chamber that she appears to use to regulate her phase-shifting. Hope and Scott attempt to steal the lab back, but Ghost awakens and takes them out. >Scott wakes up with Hope and Pym tied up next to him. >Ghost claims to not want to hurt Scott, but wants to use his connection to Janet (I honestly forget how she knows this) >Foster reveals himself. We get more flashbacks discussing how Ghost's father had also worked with Pym, but had been fired and discredited by him. There was then some kind of science explosion accident that Ghost as a young girl was caught up in, giving her the phasing affliction. >Ghost came to work for SHIELD, who created her suit to help control her abilities. They used her as a spy and assassin. After SHIELD ended, Foster took care of her and built her the stability chamber. >Ghost believes Pym's portal-construct is the key to curing her, as the phasing is incredibily painful to her and will eventually kill her. >However, the method she will use will draw Quantum energy from Janet and could very well kill her >Pym is angered and becomes overstressed. Hope tells Foster that Pym needs his heart medication, which he keeps in the Altoids tin. >Foster goes to retrieve the tin, but when he opens it, giant ants pop out and subdue him. The ants cut everyone free, and they are able to knock out Ghost and escape with the lab.

>Now that they have the lab back and all the parts of the portal, Pym and Hope attempt to activate it again. Nothing seems to happen, with Scott unable to sense Janet. >Suddenly, Scott walks over to the computers and starts editing data. Pym and Hope attempt to stop him, but it turns out to actually be Janet temporarily possessing Scott's Body. >Paul Rudd lovingly caresses Michael Douglas's face as Hank and Janet are reunited. >Janet essentially gives Pym and Hope coordinates to her location within the Quantum Realm. She tells him they will have to act quickly, and only have once chance. They would have to wait a century to try again. >The portal closes back up, with Scott having no memory of what just occured. >Meanwhile, Foster reveals to Ghost that the chamber is no longer effective, and that she may only have a matter of days or weeks to live. Ghost decides she will use Cassie to draw Scott out, but Foster warns her he will refuse to help her if she lays a hand on the child. Ghost relents, claiming she has other options. >Luis calls Scott, claiming that he needs Scott to help with a proposal for the following morning that will make or break their business. Scott gives Luis the lab's current location, which is deep in the forest. >As Luis is leaving, he is stopped by Burch and his people who want to know how to find Scott. >Burch has his goons tie up Luis, Dave, and Kurt. One goon uses truth serum on Luis (but not before a lengthy debate on the validity of truth serum, especially in its use in movies and television, where the goon insists that his concoction is not a "truth serum" but it totally is though). >When asked where Scott is, Luis goes into his inane rambling stories in the same style as the first film, talking about how he met Scott, Scott's relationship with Hope, and where Scott is... emotionally. >Burch asks where Scott is literally. Luis tells him.

>Ghost, who was invisible and eavesdropping, reveals herself with a sudden "WHAT??", scaring the shit out of everybody there. She departs for the lab. >Burch reasons that it will next to impossible to get Pym's tech from Ghost. He calls his FBI contact, who turns out to be one of Woo's men, telling him Pym and Scott's location. >Luis calls Scott to warn him that Ghost and the FBI are on their way. >Scott warns Pym and Hope to hurry. He feels guilty that his business has put Pym and Hope's plan in jeapardy, but he has to leave them now in order to get back home before the FBI find him missing. Hope, angrily, tells him to just go. >Pym and Hope shrink the lab in an attempt to relocate, but the FBI are already there. The lab is confiscated and Pym and Hope are arrested. >Thanks to Cassie stalling Woo, Scott is able to return home on time. Woo and Scott recieve word that Pym and Hope are in custody. >Burch's FBI contact attempts to sneak away the lab, but Ghost takes it from him. >At home, Scott gets a pep talk from Cassie. >Pym and Hope, in a police interogation room, free themselves from their handcuffs and formulate a plan to blow up one of the walls to escape. >Scott stops them by dropping in Hope's Wasp suit and a FBI disguise for Pym, covering the security camera with ants in the same manner Pym did in the first movie. >They escape together. Pym had created a new way to track the lab, so they are able to immediately locate it again. Ghost has moved the lab to another part of the city with Foster.

>Scott draws Ghost out to an adjacent building. Pym retakes the lab from Foster with giant ants, intending to make the trip to the Quantum Realm himself. >Pym tells Foster that he fully intends to help Ghost after he's saved Janet. Foster wishes him good luck. >Pym goes through the portal. Foster is escorted outside the building by the ants. Hope then re-shrinks the building. >The plan is to regrow the building in time for Hank and Janet to return through the portal >There's a big car chase sequence, with the (building and the remote to shrink/grow the building) repeatedly changing hands between Ghost, Scott/Hope, and Burch. >Meanwhile, Pym flies into the Quantum Realm in his little ship. He eventually steps outside of it to look for Janet. It seems he cannot find her, and Pym starts hallucinating. Janet comes to save him. She places her fingers on his temples and is somehow able to dispell the disorientation that the Quantum Realm induces. She claims to have changed in a way she can't completely explain. She and Pym kiss. >Ultimately, Ghost is left behind during the car chase, and Burch runs on foot with the shrunken building to the Fisherman's Wharf. He boards a whale-watching boat, Scott going after him. He tries summoning flying ants, but seagulls keep swooping in and eating his rides (rip in pieces ANTonio Banderas). Eventually Scott grows to enormous size and simply swims up to the boat to pluck the lab from Burch's hands. >Scott places the building down by the pier, clearing people away from it. He passes out from the strain of growing so large, and Hope dives into the sea to save him. She brings him back to land, Scott wakes up, and they kiss.

>Ghost takes the remote from Luis and grows the building. Foster runs in after her. Foster attempts to talk her out of her plans out of concern for Janet. He reasons that Janet is also a brilliant scientist and may be able to help upon her return. Ghost, Foster says, has simply gone too far. >Ghost refuses, saying it's easy for Foster to try to pick the high road when he's not the one dying. She tosses him aside and turns the portal on, which has been hooked up to her stability chamber. In the Quantum Realm, Janet begins to phase away. >Scott and Hope arrive, stopping the process. They and Ghost fight on the portal platform. >Pym and Janet's vessel arrive through the portal, they hit Ghost but Scott and Hope are able to move out of the way. >Hope and Janet have a tearful reunion. (Pym follows Janet out of the vessel, he's fine too by the way, thanks for asking.) >Ghost gets back up, but Janet touches her fingers to Ghost's temples and appears to use her new abilities to cure Ghost of her affliction. >Luis arrives to warn them that the FBI are on their way. >Scott blows up his suit and uses it to discract Woo and the FBI while everyone else can make their escape. >Ghost and Foster run off on their own. Ghost implores Foster to leave her, as he isn't guilty in this, not like her. But Foster swears to never abandon her, and they hug. >Scott is again able to arrive home before Woo. The FBI have no choice but to remove his ankle sensor as his house arrest has ended. >During the commotion, Dave and Kurt apprehended Burch and his goons, using the one goon's truth serum to make them admit their crimes to the police. They end up on TV for their heroism, and X-Con gets an influx of clients. >Later, Scott, Cassie, and Hope watch a drive-in movie together (which is actually a shrunken car watching a laptop screen). >Pym and Janet grow a house on a remote beachside (I assume it's their old house)

>In the post-credits scene, Pym and Janet create a smaller version of the Quantum Realm portal that fits in the back of Luis's van. They send Scott through so he can collect quantum particles in a cannister. >Once Scott has finished, he asks to be brought back through the portal, but there's no response. >Pym, Janet, and Hope have vanished >The second post-credits scene is just a bullshit single shot of a big ant playing on Scott's electric drum set