Ben 10/Generator Rex: Heroes United/Awesome


 * Here's a list of the Ben 10 Aliens that appear on screen (most are just cameos): Heatblast, Wildmutt, Diamondhead, Stinkfly, Upgrade, Rip Jaws, Way Big, Four Arms, Rath, Echo Echo, Chromastone, Amfibian, XLR8, Cannonbolt, Spidermonkey, Goop, Jet Ray, Big Chill, Shocksquatch and Brainstorm. They got the band back man!
 * Upgrade!Rex. Hell, yes!
 * The fight between Ben and Rex at the start, it is just awesome!