nice game especially when you got different alien forms that you can switch while your fighting
At the start of the game, a mosquito-like drone extracts much of the DNA from the Omnitrix, leaving only Fourarms and Heatblast on the watch. Ben finds that the stolen DNA is being used to power various robots in the form of Omnitrix Crystals, and in destroying these robots he regains some of his alien forms.
Ben later finds Vilgax's drones and the Forever Knights fighting. Enoch is building a mech using technology from Area 51 in an attempt to stop Vilgax; and though he is also trying to save the world, he isn't willing to let the Tennysons help. By defeating Enoch's mech, Ben acquired another Omnitrix crystal, unlocking XLR8 and later, Cannonbolt.
In San Francisco, Ben learns that Kevin escaped from the Null Void and brought some plant creatures along. Kevin 11 kidnaps Max and escapes to the crater lake, where Ben defeats him. Kevin 11 is then drawn in the Null Void again. Ben tracks down and defeats the mother plant in Seattle. He gets another crystal and unlocks Wildvine.
In outer space, Vilgax and Ghostfreak are working together, the latter having released Vilgax from the Null Void. Ben, Gwen, and Max find out about Ghostfreak after defeating an overshadowed Hex. They also learn that he plundered the Plumber's base. Ben fights Ghostfreak at the Navy Pier, and is then locked in the Null Void by Max.
Ben finds out about Doctor Animo using the Alien DNA to create a mutant army. Ben fights them, but Doctor Animo manages to kidnap Gwen. After defeating Clancy (who works for Doctor Animo), they receive a hint about Gwen's location. They reach an oil platform, where Ben encounters Doctor Animo. Ben defeats him and saves Gwen. He also regains another Omnitrix crystal, which unlocks the next and last part of the Master control. During her imprisonment, Gwen learned that Doctor Animo works for Vilgax. She also learned that Vilgax wants to draw the entire planet in the Null Void.