One of the world's best-known online personalities is facing a lawsuit.Jimmy Donaldson, better known as "MrBeast," is a 26-year-old YouTube star with more than 300 million subscribers. He's built an empire offering huge prizes to viewers on his videos.

Five contestants on a YouTuber's Amazon game show, "Beast Games," allege in a new lawsuit that they were subjected to mistreatment and sexual harassment while working under the terms of unfair contracts.