Beth and Jerry's Titanic-themed cruise kicks off the episode. Before departure, Beth delivers an ultimatum to Rick: if anything happens to the house or the kids when she gets back, his adventures with Morty will come to an abrupt end. Morty clutches this "family safety contract" like it’s a matter of life or death, but no sooner have the words left Beth’s mouth than the garage door is corroded into a huge hole by Rick’s experimental fluid—an inevitably chaotic party is already brewing.
Summer originally plans to invite her classmates over for a party to boost her popularity, only to be shot down by Rick in one sentence: "You can't throw one because I'm throwing one." Half an hour later, the Smiths’ living room has been transformed into an interdimensional party scene—Summer’s high school classmates crowd the sofa taking selfies, alternate-universe Ricks from Ricklantis guzzle drinks around an alien alcohol dispenser, Gearhead plays electronic music with his mechanical arms, and even Abraham Lincolnler, Rick’s failed DNA hybrid of Abraham Lincoln and Adolf Hitler, crashes through the wall to join the fray. Only Morty scurries around like an anxious butler, patching up broken table lamps and trying to uphold his mom’s rules amid the chaos.
When Morty tracks down Rick, panicking that "the house is falling apart," his grandpa forces him to sit through a half-hour lecture on interstellar history using the "Chronicles of the Gear Wars." "We’ve been adventuring for a year—time to give the universe a vacation," Rick says, shoving a glowing neon drink into Morty’s hand. Just then, Jessica, Morty’s long-time crush, pushes open the door, instantly diffusing the awkward tension. Meanwhile, Summer is going out of her way to distance herself from her ordinary friend Nancy to maintain her "cool girl" image—until Rick calls her out: "The rule of parties is to welcome everyone, including the friends you’re scared to admit you have."
Chaos escalates when Lincolnler loses control. This half-upstanding, half - hybrid erupts in a fight after accidentally bumping into Summer’s classmate Brad, whose punch causes Lincolnler’s Lincoln persona to completely crumble. Horrified by the violence, Jessica storms out of the house, and Morty chases after her immediately. In Rick’s garage, Morty tries to use alien gadgets to set a romantic mood and confess his feelings, only to stumble on Mr. Poopybutthole in the middle of "getting his freak on." As he stumbles backward in panic, he knocks over Rick’s space teleportation device—and the entire house is instantly transported to an alien world teeming with giant monsters.
While Morty screams at the unfamiliar purple sky, Rick is busy observing the carnivorous plants outside the window with great interest: "Nice air—perfect for continuing the party." After Morty’s furious protests, Rick finally reveals the solution—a Kryllian crystal a few kilometers away that can restart the teleportation device. But he insists on staying to "keep the party going," so he pushes Lincolnler into the mission, Summer drags along Nancy, and the three form an impromptu team to retrieve the crystal, leaving Rick to keep the party alive in the alien world.
On the Titanic-themed cruise ship, Jerry is indulging in a "romantic encounter" with Lucy, a housekeeper—bonding quickly over their shared love for Titanic. But the fling takes a dark turn when the ship fails to "sink" as planned due to a technical glitch. Lucy suddenly pulls a gun on Jerry, forcing him to recite movie lines verbatim and even threatening violence. At the crucial moment, Beth—who has been indifferent to the trip—bursts in with a fire axe, rescuing her husband. The rift between the couple quietly heals amid the crisis.
The crystal-retrieval team’s journey is equally fraught with twists. Lincolnler displays Lincoln-esque courage in a fight against alien monsters, Nancy uses her geography knowledge to locate the crystal’s burial site, and Summer finally lets go of her prejudice, reaching out to hold Nancy’s hand. When the three return with the crystal, Morty relays Lincolnler’s final words to Rick—only for Rick to crush the ore into powder and use it as a stimulant to make the party even wilder.
By the time Rick teleports the house back to its original location, Jerry and Beth are just minutes away. "One more block," Rick says calmly, pressing the red button on his controller—time freezes instantly. In the motionless party scene, Rick, Morty, and Summer divide the tasks: Morty cleans up piles of alien drink cans, Summer repairs the shattered windows, and Rick uses a shrink ray to pack the intoxicated alien guests into storage boxes.