Play ben 10 ultimate alien: galactic challenge game, take the galactic challenge and master 20 mini-games featuring aliens like swampfire, ultimate big chill, humungousaur, waterhazard, spidermonkey, jetray, ultimate cannobolt, ultimate echo echo and brainstorm. only the ultimate player can beat all 20 games with all 10 aliens. are you up to the challenge? good luck and have fun playing free online ben 10 ultimate alien: galactic challenge game
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