ben tennyson is a teenage boy who found an extraterrestrial watch-like device called omnitrix with which he can transform into more than 10 k alien type . it allows him to alter his DNA to dozens of aliens . Omnitrix has evolved throughout the show to become : ultimatrix , nemetrix , and biomnitrx. since the first time he wore the omnitrix , ben has encountered many powerful villains such as : vilgax , albedo , Forever knights and highbreed.