Task: Question Answering
Input (English): Passage: Born without an immune system, Jimmy Livingston is forced to live in a sterilized dome in his bedroom, earning him the nickname "Bubble Boy" by his neighbors. Jimmy's overbearing and devout Christian mother only exposes him to Highlights magazine and the Land of the Lost for entertainment. When he is a teenager, a girl named Chloe moves in next door. Jimmy is immediately taken with her, and eventually befriends her despite his mother's discouragement.
Chloe visits Jimmy and tells him that she is leaving for Niagara Falls to marry her  boyfriend, Mark, in three days. Jimmy  realizes that Chloe cares for him. Realizing how much he cares for her, Jimmy builds a mobile bubble suit and runs away from home, determined to stop the wedding.
On the first day of his journey, he's unable to afford a bus ride to Niagara Falls, but is picked up by an overly enthusiastic cult on a pilgrimage towards enlightenment. By this time, Jimmy's mother has discovered her son missing, so she and her husband set off to find Jimmy.
While traveling through the desert, Jimmy meets Slim, a  biker with a flat tire. Jimmy offers to fix the flat with some patches and the two become friends. Elsewhere, Gil, the leader of the cult Jimmy met, has revealed that their messiah is "the round one," and that whoever rejects him will suffer. The group who abandoned Jimmy set off to find him. Jimmy and Slim have traveled to Las Vegas for traveling money. However, Slim gets caught up in the Vegas life so Jimmy goes on without him. The cult runs into Slim in Vegas while asking for directions. Slim recognizes them from Jimmy's story and threatens them, only to have his bike destroyed by the cult bus.
Soon Jimmy accidentally boards a train belonging to Dr. Phreak, a small man who collects freaks and shows them off to the public for money. When Dr. Phreak tried to recruit Jimmy to his show, Jimmy knocks him unconscious; allowing for Jimmy and the freaks to go their own way. 
Question: What is the last name of the person that is trying to stop Chloe from marrying her boyfriend?
Output (English): Livingston.