When they first met, Kevin, was a renegade 11-year old, who knew Gwen as Ben's smart-mouthed cousin. Gwen distrusts Kevin at their first meeting and says that she does not like Kevin and that he is just trouble. Gwen and Kevin do not show any interest for each other. He later had a vengeance against Ben and almost burned Gwen in the episode Framed. In Back with a Vengeance, Kevin holds Gwen hostage so that Ben would give up the Omnitrix. Ultimately he gets trapped in the Null Void. They barely come into contact for the remainder of the series.