With Kevin having absorbed Ben's aliens and become insane once again, Ben and Gwen have to go to the null void prison in an attempt to stop Kevin from destroying all the people there. We learn more about how Kevin got his material absorbing powers. In the end Ben thinks Kevin should be put down.
Elenco: Ashley Johnson , Dee Bradley Baker , Greg Cipes , Yuri Lowenthal , John DiMaggio , Wil Wheaton , Vyvan Pham , Jeff Bennett , Peter Renaday .