"Quintuplets 2000" is the fourth episode of Season Four, and the 52nd overall episode of South Park. It aired on April 26, 2000.
The boys discover a performing group of Quintuplets at a circus, and decide to put on their own performance. Meanwhile, the Quintuplets and their grandmother try and escape Romanian Government officials, who want to bring them back to Romania.
After the boys watch a French-Canadian circus named Cirque Du Cheville, they decide to form a performing circus - mainly inspired by the amazing tricks Quintuplets. After a couple of practice sessions, the boys think Kenny McCormick needs to learn how to sing better, during this, the quintuplets from the show, along with their grandmother, try to escape from the Romanian government. After eluding them, they turn up at the Marsh Residence and ask for shelter. Kenny tries to learn opera via audio tapes and during the night, Marvin Marsh and the Quintuplets' Grandmother meet and have sex.
After finding the Grandmother dead due to the sex, Randy Marsh tells the Quints that their grandmother is dead. Stan, Cartman and Kyle persuade Randy to let the Quints stay so they could use the quints for their circus, in which their performance is to do some contortions wearing only underpants with the Quints doing their performance). The boys then decide to show the quints how great America is, hoping they'll stay and do their circus. Meanwhile, the Romanian government seek Janet Reno to help get the quints back. Also, seeking to get to Romania for opera singing training, Kenny sings the aria "La donna è mobile" from Verdi's Rigoletto for money in order to acquire transport for him and his mother. In Romania, Kenny becomes a famous opera singer, and, after his mother realizes that her little money from the US makes them rich in Romania, the two decide to stay. Back in the US, the Marsh house is surrounded by protesters, hoping to let the quints stay. In a parody of the Elian Gonzalez affair, Reno dresses as the Easter Bunny and armed with a gun, she captures the quints. Stan, Kyle and Cartman, who don't want to lose their circus, enlist the help of the protesters outside to get the quints back. A large amount of violence starts between the protesters and government soldiers, which is stopped by the quints after they chide all the groups on their shortcomings: that America just wants them for money, Janet Reno for doing it for publicity, Romania for being selfish and wanting them for recognition, their father for acting like he missed them forever when he actually walked out on them five years ago, and the boys for their ignorance about Romanian culture. They then leave South Park to go on The Oprah Winfrey Show and start a press tour.
Meanwhile, the exact opposite of the quints' situation is occurring with Kenny in Romania. With Romanians protesting outside his house to let him stay, American soldiers invade the house and Kenny is inadvertently killed by the U.S. government, who had hoped to bring him back alive.