Katherine is a rich girl that enjoys sex, manipulating people, and wielding power. When her mom marries Edward Valmont his son Sebastian starts to live with her. Kathryn sets up an elaborate scheme to have Danielle Sherman pretend to be innocent to seduce Sebastian and show him that just how pathetic he is. Kathryn enjoys bossing around her houseguests and corrupting the innocent mind of Cherie Crayman whom she teaches the "joys" or horse riding to.

Danielle plays an innocent girl in the film who Sebastian constantly tries to seduce. She is playing him the whole time though. At the films end Kathryn shows up with Danielle at the moment Sebastian thinks he is going to get lucky with Danielle. This was supposed to devestate him as Sebastian had found true love. In reality he is offered two girls at once; Danielle and Kathryn. Thats some punishment and lesson learned.

Cherie is the film's ditsy girl. She is one of Kathryn's special projects. In one memorable scene she is taught to ride a horse and "really grind" the saddle doing what is called posting. Kathryn got a kick out of the experience and Cherie came away with the wisdom that "posting is fun." At the film's end Sebastian and Kathryn team up to see how "sexy" Cherie can be and Sebastian takes loads of pictures.

Sebastian is new to the world of the Merteuil's who are rich and powerful. When his father married Tiffany Merteuil he was allowed to enter their circle of power. Sebastian enjoys trying to seduce Danielle whom he is lead to believe is very innocent. Sebastian in this film is himself quite innocent until the film's end when he is faced with the challenge of being with his step sister Kathryn and Danielle his dream girl at the same time.

This is another of the Merteuil's servants. During a card game organized by Sebastian she speaks out most vocally about how stuck up Katheryn is.

This is Kathyrn's mom. She enjoys massages, running fund raisers for her school, and her new husband Edward. She is very similar to Kathryn in her perspectives on power and influence.

This is one of Katherine's information people. In exchange for cash he gets Katherine a copy of Sebastian's real school transcript which differs remarkably from the one he bribed a UPS employee to deliver in its place.

These two are the twins whose mission is to sexually frustrate Sebastian. They just arrive on the scene while he is in the shower and start kissing and fooling around. When Sebastian is aroused they leave.