Plot Synopsis

Now 16-years-old and with his secret identity revealed to the world, Ben has even more adventures -- besides being able to drive the Benmobile. After his Ominitrix was destroyed, Ben takes possession of the Ultimatrix. Of course he's still able to change into Big Chill, Humungousaur and the rest of his previous alien transformations, but an extra half-turn of the Ultimatrix's dial reveals a whole new menu of extreme versions of these aliens, including: Ultimate Humungousaur, Ultimate Big Chill, Ultimate Echo Echo, Ultimate Cannonbolt, Ultimate Swampfire, and Ultimate Spidermonkey. He must also battle Aggregor, an Osmosian villain who plans to absorb the powers of five unique aliens whose combined abilities will make him unstoppable! Ben, Gwen and Kevin must work together to stop Aggregor before it's too late.