Mike is a nice, well-meaning teenager. However, he isn't himself a lot of the time, as he suffers from Dissociative Identity Disorder (DID) or Multiple Personality Disorder as it is called in the show. This causes him to involuntarily switch to a different person in certain situations, afterward with no memory of what has happened. According to Mike himself, his condition has caused him much strife in the past. This contributes to him refusing to tell the other contestants about it at first.