Timmy's idea to raise money for the summer camp has everyone in South Park trying out the latest trend in transportation. Timmy's success makes him a lot of enemies and a bloodbath of epic proportions is on the horizon.
The next day, a Russian taxi driver is annoyed by the lack of people using the taxi service and sees Handicar in action, infuriating him. At a car dealership, the Hummer Salesman is trying to sell Hummers to people when Timmy picks them up.
At a disclosed location, the handicapped kids and the counselors are going over the funds for summer camp. Timmy has raised a lot of money. Nathan doesn't want to go to summer camp after getting raped by a shark in "Crippled Summer" and, with Mimsy's help, is going to keep Timmy's Handicar business from funding the summer camp.
That night, at the Community Center, the various cab drivers and the Hummer salesman conspire to end Handicar and Nathan helps motivate them.
At the Burch residence, the cab drivers 'break' Timmy's legs.
The next day, the cab drivers are shocked to find Handicar still up and running, with Nathan furious at their stupidity.
Nathan calls Timmy later and convinces him to hire others to help cover the Handicar work load. Nathan is hired and tries to sexually harass a woman to put Handicar out of business. The woman turns out to be transvestite and rapes Nathan.
Later, Nathan's plan has backfired as there are now many more Handicar workers.
At a Tesla conference, the CEO is constantly questioned about Handicar. Somehow, Nathan and Mimsy are looked to for a solution and Nathan suggests a race between Timmy and the CEO.
CNN breaks the news that another Wacky Races was upon the world. The adults in South Park immediately go buy milk and cereal. Timmy is unsure of the race but finally decides to race.
In the Wacky Races, Lyft, Zipcar, a Taxi Cab, A Hummer, A Tesla D, The Queef, the Handicar, a completely automated self driving car from Japan, and Dick Dastardly and Muttley are competing.
The Tesla D is in the lead, but Nathan tells the CEO to slow down because Timmy needs to pick up the passenger and then have it stolen from him. The Lyft car picks up the passenger but the Hummer salesmen steals her and allows her to drive the Hummer in order to sell it. The Tesla CEO destroys the Hummer but whilst trying to get her to the Tesla D, she is stolen once again, this time by the Taxi cab. The Queef driver runs out of queefs to power her vehicle. Dick Dastardly and Muttley cut down a tree, making the Taxi cab and Self-driven Japanese car crash. However, the Handicar doesn't crash and picks up the passenger, to Dick Dastardly's surprise.
The Tesla D is on its way to get the Handicar but is overrun by all the other Handicars. Nathan and Mimsy are now using Dick Dastardly and Muttleys's car but Nathan stops to detonate a bomb he thinks is on the Handicar but is rather on the Zipcar. The Zipcar blows up and Matthew McConaughey, who was driving the car, is sucked into a wormhole. The Handicar wins the race.
Timmy has donated $2.3 billion and with summer camp inevitable otherwise, Nathan takes Mimsy's advice and asks his mom to let him stay home. His mom pretends not to understand him and dismisses him. When Nathan's father questions what he said, his mother tells him that Nathan said he didn't want to go to summer camp, but "she'll be damned if he's going to ruin their Italy trip."
AV Club gave "Handicar" a "C+" rating saying: "Eighteen seasons in, South Park digs deep into the wellspring of pop culture in order to skew current-day issues. The result is often tack-sharp satire but can easily swerve into senseless, humorless pastiche. “Handicar” lies somewhere in the middle with an extended send-up of Wacky Races, the 1968 animated series featuring Dastardly and Muttley, and a take on the current ride share “controversy,” pitting tech startups like Uber and Lyft against the staid taxi industry."
IGN gave "Handicar" a "5.0" rating saying: "This week's South Park was bogged down with repetitive non-jokes from Nathan and Mimsy, who meekly returned to prominence in "Handicar." While the Wacky Races send-up offered a few humorous moments, Timmy's ridesharing service and all other car-related references fell pretty flat. It also didn't help that none of the boys were in this episode at all."