Ben gains another Omnitrix hero to use, which he calls Ditto. Gwen can't stand being around the multiplying Dittos, and they end up giving her headaches. The Dittos, though, prove to be real helpful against Dr. Animo and his multiplying Stinkflies after he extracted some of Ditto's DNA.
Elenco: Ashley Johnson , Charlie Schlatter , Dwight Schultz , Greg Cipes , Greg Ellis , Jeff Bennett , Jim Ward , John DiMaggio , Kevin Conroy , Kevin Michael Richardson , Michael Dorn , Peter Renaday , Richard Green , Rob Paulsen , Robin Atkin Downes , Tom Kane , Vicki Lewis , Yuri Lowenthal , Jennifer Hale , Kari Wahlgren , Khary Payton , Tara Strong , Claudia Schmidt , Meagan Smith , Paul Eiding , Ulf Söhmisch , Dee Bradley Baker , Fred Tatasciore , Richard McGonagle , Richard Steven Horvitz .