Amy buys a car at Malfunctioning Eddie's Rocket-car Emporium, and asks Fry to take a road trip to Mercury that led to a long wait for a tow truck after they're out of gas. Then, she and Fry began dating after making out. Meanwhile Bender decided to not get the recommended safety features installed (including a bumper on his shiny metal ass that makes it look like a proper human ass) and is warned that his ass could explode at any time.
With Valentine's Day approaching, Bender decides to start a computer dating service. Fry worries that he and Amy are spending too much time together, and asks Leela to come with them on a picnic to Europa they had planned. When she refuses, Fry asks Zoidberg to come with them. Zoidberg comes with them, but when Fry asks him to drive, he crashes the car, and Fry wakes up to find Zoidberg telling him that his body is badly damaged in the crash. Fry, in shock, discovers his head is grafted onto Amy's shoulder in order to be kept alive. After returning to Earth Fry breaks up with Amy, and she makes Valentine's Day plans with another man.
The three (Fry, Amy and Amy's date) wind up at Elzar's, where all the people who applied to Bender's dating service-including Leela-are with their dates. All these dates are flops, however; Bender merely rounded up a bunch of strangers from the bus station, and they all leave for the bus ride home. Amy hits it off with her date, and is about to leave with him, and Fry's unwilling head. Luckily for Fry, Leela spots him across the room and comes over to save him. By saving Fry, she tricks Amy's boyfriend into talking about his job-banking industry regulation-and he soon winds up talking very boringly, distracting him from leaving with Amy. Fry quietly thanks Leela for the assistance.
The next day, Zoidberg reattaches Fry's head to his now-repaired body, and everything returns to normal. Some of the nerves in Fry's neck were apparently rewired so that Fry's left leg hits him every time he touches his neck. As a result, Fry kicks Bender; and his explosive butt finally blows.