Kenny Bania, Jerry's rival, continues to take Jerry's past material, and even starts dating one of Jerry's ex-girlfriends. To change this, Jerry decides to do badly in one of his acts so Kenny will do bad as well. But Jerry's plan completely backfires. Kramer starts shaving using butter and starts roasting himself in a sauna. Newman sees him as a giant turkey and chases him around. Meanwhile, Elaine and Puddy travel to Europe together, and George tries to hide that he's a closet Bania fan.
Frank begins to use the phrase "serenity now" every time he feels his blood pressure rising. Elaine is invited to a bar mitzvah for her boss's son and is French kissed by the son. George begins to work as a computer salesman, but isn't good at selling them to other people. Jerry's girlfriend gives Knicks tickets away, which makes Jerry mad, but he doesn't show it. His girlfriend comments that he never gets angry, so Jerry attempts to show his anger.
Jerry's parents hire a personal trainer for him. However, the trainer is very old and ends up throwing out his back. Kramer begins stocking up on his own blood, but runs into refrigeration problems. George decides that if he could combine sex and food, he would have the perfect life. Elaine's friend thinks Elaine is too irresponsible to watch her son but tries to prove her friend wrong. But when babysitting is more than Elaine bargained for, she tries to show that she is irresponsible to get out of it.
Kramer gets disgusted with all of the junk mail he receives, so he closes off his mailbox and forwards all of his mail to Jerry's box. Jerry has a show to help a car dealership owned by "Fragile" Frankie, and is given a van for his help. Meanwhile, George thinks his parents are avoiding him, and Elaine tries to get Puddy back.
Kramer finds part of a Merv Griffin Show set in a dumpster. He sets the pieces up in his apartment and creates his own show, featuring him as a host. Jerry's girlfriend collects old toys and refuses to let anyone play with them. George hits a squirrel and his girlfriend has him take the squirrel to the vet. Meanwhile, Elaine has to deal with an annoying co-worker.
Elaine's neighbor is out of the country and left her alarm set to go off at 3:30 am. Kramer buys a meat slicer, and Elaine breaks it when he lets her borrow it. Jerry's new girlfriend is a doctor who only talks about healing people. George gets a new job and realizes that he knows the boss from somewhere.
In an episode told backwards, Jerry, George and Elaine return home from their India trip and they don't want to talk about the trip or even talk to each other. George finds out that Jerry slept with his girlfriend and to compensate, George wants to sleep with Elaine. Elaine tells everyone that she once slept with Sue Ellen's fiance, which causes Sue Ellen to call off the wedding.
Jerry's girlfriend, Gwen, looks either ugly or beautiful depending on what type of light she is in. At a Hanukkah party, George receives a donation made to a charity in his name as a gift. George sees this as an opportunity to not have to give out gifts, and sets up a fictitious charity, "The Human Fund", which he makes donations to on behalf of his co-workers for their gifts. However, George is found out, resulting in the story of Festivus. Meanwhile, Kramer resumes working at a bagel shop after a 12 year strike.
Puddy is promoted from a mechanic to a car salesman, so Jerry tries to use Puddy to get a good deal on a new car. But when Elaine and Puddy get into a fight, Jerry tries to get them back together so he can get his good deal. At the dealership, George tries to get a twinkie, but the vending machine won't take his dollar. Meanwhile, Kramer test drives a car and pushes it to the limit to see if it can handle a day in the life of Kramer.
Elaine comes across a cartoon in the New Yorker, but can't figure out why it's funny. She then becomes determined to get her comic published. Kramer's honesty gets Jerry in trouble with Sally, an old friend of Elaine's, and she begins to do stand-up about how mean Jerry is. George's new girlfriend looks like Jerry, but he refuses to believe it.
Jerry and George spend time at a bookstore in order to meet women. There, George takes a book to read into the bathroom, and is forced to buy it. Jerry sees Uncle Leo shoplifting, and tells his family about what he saw. Kramer and Newman start their own rickshaw business. While drunk, Elaine makes out with a co-worker, then makes up a story about dating him to avoid trouble at the office.
At a Mets game, Elaine, George, Jerry, and Kramer decide to leave in the 8th inning since the Mets are losing 8 to 0. However, they have a tough time getting home due to a Puerto Rican Day parade. George is taunted by a man with a laser pointer. Kramer accidentally sets the Puerto Rican flag on fire and is mobbed by a group of people.
A look back on relationships, break ups, and other clips from the past nine seasons of Seinfeld.
Songs: Green Day
-- Good Riddance (Time of Your Life)
In part one of the finale, the gang find out that the pilot for Jerry's show has been approved and 13 episodes were ordered. NBC lends the foursome a jet to use before they have to move to California for the show, and they decide to go to Paris. While in the air, Kramer tries to get water out of his ear, but ends up stumbling into cockpit, sending the plane into a dive. The plane has to land, and on the ground, the gang sees a robbery, but don't attempt to help, so they are arrested. Several characters travel to their trial, including Jerry's parents, Peterman, Puddy, Newman, and others.
The "Seinfeld" Story is an NBC special in which Jerry takes questions from the audience while doing a stand-up act. When one audience member asks where the series came from, Jerry shows the crowd a videotape which included the early production of the show, and the people involved in that production. Each main cast member talks about the first seasons of the show and the episodes that were turning points in the show's success. Throughout the show, there are several clips and bloopers from Seinfeld's beginnings.