"The Challenge" casts are season specific as the cast varies from season to season. The casts are made up of contestants originating from one of "The Challenge's" related TV programs and contestants originating from one of the few "Challenge" seasons that have allowed previously unknown contestants. These shows and seasons are: "Real World", "Road Rules", "Are You the One?", "The Challenge" (from ', ', "Spring Break Challenge" and ""). Many recent alumni come from a variety of reality shows "Big Brother", "Survivor", "The Amazing Race", "Ex on the Beach", and "Geordie Shore".