Kevin Levin is a recurring character in Ben 10: Alien Force and Ultimate Alien. He's a skilled martial artist with a strong sense of justice and a sarcastic personality. He was initially a rival to user, but they eventually became friends and allies.  Kevin's powers come from the same source as user, the Omnitrix, but he gained them accidentally and can't control them as well. This often leads to him being a danger to himself and others. Kevin loves gwen and is currently dating her.