Game Ben10 Destroy All Aliens: GALACTIC CHALLENGE - Ben 10 Ultimate Alien Games - Take the Galactic Challenge! Master 20 mini-games featuring aliens like Swampfire, Ultimate Big Chill, Humungousaur, Waterhazard, Spidermonkey, Jetray, Ultimate Cannonbolt, Ultimate Echo Echo and Brainstorm. Then check out the Ben 10 Game Creator to build your own levels and share them with your friends. Only the ultimate player can beat all 20 games with all 10 aliens. Are you up to the challenge? Check out Ben 10 Ultimate Alien Games and hundreds of other games for free on Alien Games Online. Use the number Ultimatrix's aliens to fulfill missions. At each stage completed, a new ultimate alien will be released, increasing his collection. It's hero time!