George's car breaks down just as he arrives at the airport to pick up Jerry. Both now stranded, they notice a limousine chauffeur waiting for a passenger called O'Brien. Since Jerry saw someone named O'Brien being left off of his overbooked flight, George passes himself off as O'Brien. They bluff their way onto the limousine, which is headed to Madison Square Garden with four tickets for that night's Knicks–Bulls game.
Exhilarated over their score, Jerry invites Elaine and Kramer to share in the ill-begotten tickets, and lets them in on their fake names. The driver picks up two passengers, panicking George and Jerry, but they continue their charade. The pair, Tim (Peter Krause) and Eva (Suzanne Snyder), identify themselves as adherents of O'Brien—who has never publicly shown his face—and eagerly anticipate his planned speech that night.
Reading the speech, George realizes that he has taken credit for a white supremacist polemic, and that their fellow passengers are Holocaust deniers. When the limousine harmlessly blows a tire, the spooked followers react militantly, revealing a collection of military handguns, while Eva declares her loyal devotion to George, arousing him. Meanwhile, a news anchor reports that Donald O'Brien, a neo-Nazi leader and an insurrectionist who has even drawn David Duke's condemnation, is arriving to speak at the Paramount Theater, while a protest mounts to denounce O'Brien.
Kramer, educating Elaine about Michael Jordan, tumbles into a pile of trash while attempting to dunk. Elaine's friend invites her to join the protest, and Kramer connects the dots between O'Brien's name and George and Jerry's limo ride. In confusion, he questions whether Jerry is secretly a neo-Nazi leader, or secretly a CIA agent infiltrating them.
George's bad hamstring stops him from running, and he misses his chance to call the police. George and Jerry decide to rendezvous with Elaine and Kramer and escape. When they meet up, angry protesters overhear mentions of O'Brien, and the group is forced to flee in the limo. Just as Tim demands an explanation from Kramer over his confusion, the real O'Brien calls the limo, blowing George's cover. Held at gunpoint by Tim and Eva, the group, except Kramer, frantically babbles confessions and groveling over each other, while protesters close in. As the crowd forcefully rocks the limo, the Nazis kick the group out. George desperately tries to correct the news broadcast identifying him as O'Brien.