While crash-landing Rick's ship in the ocean, Morty unexpectedly talks Jessica (Kari Wahlgren) into a date. Unfortunately, landing in the ocean provokes Rick's hitherto unmentioned nemesis, Mr. Nimbus (Dan Harmon), King of the ocean and controller of the police. Morty attempts to have a normal date at his home with Jessica while also helping Rick host a dinner party to placate Mr. Nimbus. In the process, he accidentally meddles with the history of an alternate dimension where time moves orders of magnitude faster than on Earth. Religions develop that depict Morty as a legendary figure of doom, complicating his attempts to retrieve the wine that he has been aging there. Just as Rick and Mr. Nimbus resolve their differences, Summer returns from executing Rick's orders to steal a shell that increases Mr. Nimbus' strength, inciting Mr. Nimbus to beat up Rick and have him arrested. Jessica decides to stay friends with Morty, her outlook on life changed profoundly from being imprisoned for eons by the alien society. Meanwhile, Beth and Jerry brag unconvincingly that their relationship has become more sex-positive.

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Post-credits scene: Beth and Jerry debate whether they should take Mr. Nimbus up on his offer of a threesome before doing so anyway, assured by Nimbus that Rick will understand.

Rick, Morty, Summer, Beth and Jerry are having breakfast when alien squid assassins kill them. They are revealed to be decoys, and the real Rick is alerted to their deaths. However, the "real" Smith family is revealed to also have been decoys, and a chaotic series of events erupt as the decoys are alerted to the deaths of other decoys and struggle to figure out which family is the original, for the original Rick did not realize the decoys would resort to making more decoys. After a family of decoys clashes and kills another, they figure out that the squids are actually further decoys trying to kill all other versions of themselves. Another family, who still thinks they are real, are kidnapped by deformed decoys trying to harvest their skin but are rescued by wooden decoys, who attempt to rally a group of decoys but are crushed to death when squid-decoys kill them. One family alerts all decoys to their location and all of the decoys are killed in the ensuing mayhem. Meanwhile, the real Smith family, on an adventure with Space Beth, are alerted to the decoys' deaths.

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Post-credits scene: Wooden Jerry, who previously escaped the squid decoys by abandoning his family, is cut into pieces by several beavers and subsequently taken by future animal-people, used as a mirror-holder in a cowboy saloon, and used as a crucifix, lamenting his inability to die.

Planetina (Alison Brie), a Captain Planet-esque superhero, puts a stop to acid rain falling on Rick and Morty. Seeing this, Morty immediately develops an interest in her. Later, Rick decides to take Summer on a trip to three planets which are about to be destroyed and are having large sexual parties to celebrate their impending doom. While Morty is strengthening his relationship with Planetina, Rick finds a girlfriend, Daphne (Jennifer Coolidge), on the first planet and takes her with him. Back at home, Beth finds out about Planetina and forbids Morty to be with her. The two run away, avoiding the 4 people with magic rings who created her (including Eddie (Steve Buscemi)), who wants to sell her to a rich Sheikh. They pursue eco-friendly activities until Planetina stumbles upon a coal mine and decides to destroy it, killing 300 miners inside. Morty is distraught and horrified by this, and decides to end his relationship with Planetina, leaving Morty severely heartbroken with Beth comforting him and telling him she understands his pain. Rick and Summer, along with Daphne, travel to the third planet. Summer, tired of Rick ignoring her, uses Rick's car to destroy the asteroid. Daphne realizes that she's no longer in any danger and abandons Rick, proving Summer's earlier claim that she did not love him.

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Post-credits scene: Two of the inhabitants of the third planet (Ferkus 9), a father and son, go back to work after their world survives. They have an awkward conversation about how they had sex together the previous night, not expecting to still be alive the next day.

Rick unknowingly uses Morty’s sperm to create giant sperm monsters. The president works with the Smith family to destroy the sperm monsters, and pinpoint them in the Grand Canyon. Rick and Morty destroy the sperm queen's base of operations and follow the remaining sperm monsters to Las Vegas, where the government has placed a giant human egg from Summer, unaware that the sperm is Morty's, to attract the sperm. Once Morty reveals the sperm is his, the US military, Vegas performers, and the CHUD (horse-people) destroy most of them, but one abnormal sperm (which Morty names "Sticky") gets to the egg and fertilizes it before it launches into space.

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Post-credits scene: Morty and Summer's "Giant Incest Baby" floats in space and mistakes a wandering astronaut for a toy.

Rick uses Jerry's social ineptitude to inflict pain on, and thereby pleasure, pain-enjoying hell-demons to repay a debt Rick owes them. After realizing that he is being used as a pawn, Jerry refuses to cooperate with the demons, which leads the demons to kidnap him to Hell. Beth and Rick save him by disguising themselves as demons and creating an "Aversion-Converting Inversion Reverter", which shoots shrapnel reverting the pain from pleasurable back to painful, and kills many of the demons. Meanwhile, Morty and Summer try to impress high-status new student Bruce Chutback by hijacking the Space Cruiser and taking it on adventures, but they are found out by the car's AI, who blackmails them into going on even more life-threatening adventures. They try to appease it by setting it up on a date with a group of shape-shifting robots called Changeformers, but after the Space Cruiser is exposed as not a legitimate Changeformer, a brawl ensues in which the Space Cruiser kills the Changeformers. Morty, Summer, and Bruce are arrested, but are then rescued by the Space Cruiser, brought back home, and forced to act like nothing had happened. Bruce states that, while he enjoyed the night, he will only hang out with Morty and Summer if they have good standing within their school.

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Post-credits scene: Bruce is ridiculed at school for wearing jeans he wore the previous day, while Morty and Summer lament that they hope he can find solace in his own company. Later outside his house, Bruce is ganged up on by Mailboxians whom Summer previously attacked in their adventure.

Morty releases a giant robot from the Statue of Liberty after accidentally destroying the Constitution of the United States in a hidden crypt. Rick tries to obtain a "turkey pardon" from the president by disguising himself and Morty as turkeys, but the president, aware of Rick's schemes, turns himself and other military volunteers into turkeys to stop him. In the chaos, a turkey is accidentally infused with the president's DNA and takes his place. The president, his forces, and Rick and Morty join forces with aliens and robots kept in stasis in the crypt to overthrow the turkey-president and his turkey enforcers. Rick is granted a pardon for his aid in the resistance.

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Post-credits scene: One of the president's volunteers retains his turkey senses and makes a public disturbance.

Rick, Morty, and Summer are on a space trip to Boob World when Rick spots a crashed GoTron ferret, completing his collection. Deciding to use the ferrets to fight giant bug-monsters attacking other worlds, the entire Smith family serve as pilots. As Rick’s obsession with the GoTron deepens, they start working with alternate-universe Smith families on building the Ultimate GoTron with all their collected ferrets, but also by stealing the other GoTrons from their universes' pilots. Summer feels like Rick appreciates her more than Morty, while Morty tries to help Summer see that Rick cares only about the GoTrons. Rick had already replaced her with an "anime girl" named Kendra; unbeknownst to Rick, Kendra commands the original GoTron pilots of the other universes, seeking their ferrets back. After Summer is fired, she reveals that her "Giant Incest Baby" (called "Naruto") is alive and she helped him escape from the military. The family returns to Rick and with Naruto's help they save him from the original GoTron pilots. After the rescue, Rick grows tired of the GoTrons.

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Post-credits scene: In another universe, a group of bugs are in a training school that wants to help other universes cure AIDS. Sadly, when walking through their portals, they are stripped of their clothes and are grotesquely enlarged. The Smiths and other planets, unable to understand their language, mistook them as a threat and attacked them.

Rick enters Birdperson's mind in order to find out why he is failing to act normally and how he could bring back the original mind of Birdperson. Memories reveal that Birdperson distanced himself from Rick after Rick expressed feelings for him and told him life was meaningless because there are infinite realities he could take them to through the portal gun. Rick discovers that Birdperson and Tammy have a daughter, who was inhibited from Birdperson's memories by the Federation. They track down Birdperson's central body, where he is cherishing his relationship with Tammy blissfully unaware of her treachery. They are hunted down by other versions of Tammy and Phoenixperson and barely escape after Birdperson's memory of Tammy reveals that she loved him more than the Federation. Birdperson is revived in the real world, but his relationship with Rick is strained when he realizes Rick concealed the existence of his daughter from him, and leaves to find her. Rick finds his younger self hiding in memories of his childhood and offers to make him real, but his past self is hesitant due to fears of becoming like Rick himself.

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Post-credits scene: Birdperson and Tammy's daughter is kept in a prison with other inmates. As she brutally kills several prisoners, the insect guards remark that it was a bad idea to put all of the violent prisoners together.

Exasperated at having to continually clean up Rick's messes, Morty accidentally spills portal fluid on his hand and finds himself able to speak to Nick, another man who spilled Rick's portal fluid onto himself. They become friends and Morty breaks him out of the psychiatric facility in which he is confined. However, Nick shows himself to be a violent psychopath who spilled Rick's portal fluid after he had tried to steal the portal gun from Rick, and he pursues Morty, intending to make him his accomplice on a crime spree. After a violent chase and struggle, Morty has a train slice off his hand and puts it in Nick's portal, causing Nick to implode. Meanwhile, Rick teams up with two crows to show Morty how disposable he is, but after an adventure wherein they save him from anthropomorphic crows attempting to savage Earth, he realizes they are more than just disposable alternatives to Morty. After repairing Morty's hand, Rick leaves him behind to travel with the two crows, leaving Morty devastated.

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Post-credits scene: An alien called "Garbage Goober" that Rick uses to clean up his trash is revealed to actually be a doctor, who is scolded by his wife but decides to continue eating the Smith family's garbage anyways.

Rick abandons his life of adventure with the crows when he discovers he is their rebound. He meets Morty at the Citadel, but they are accosted by Rick agents, who take them to see President Morty. There, President Morty reveals that he has used brain scans taken from Rick^{[lower-alpha 2]} to create a path outside of the Central Finite Curve — an isolated portion of the multiverse where Rick is the smartest man alive, having restricted access for Ricks from those where he is not. Flashbacks reveal Rick's backstory: after an alternate Rick murdered his wife Diane and a young Beth,^{[lower-alpha 3]} he invented his portal gun to scour the multiverse for their killer, creating the Curve before reuniting with Morty's family. A group of Ricks joined forces to stop him as he killed countless Ricks, eventually becoming the Citadel. President Morty reveals that he is tired of the abuse that all Ricks within the Central Finite Curve will invariably inflict upon their Mortys, and seeks to destroy the Curve in order to escape; he hacks all the portal guns in the city, causing widespread death, then flees in an escape pod. Rick, Morty, and a group of survivors jettison themselves from the Citadel, which along with the Curve is destroyed by a black hole created by the hacked portal guns. President Morty steps into a yellow portal to an unknown destination.

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Post-credits scene: Mr. Poopybutthole, now divorced, ponders on the proper course of action when one realizes who their loved ones really are, and how people do not have as much time as they think.