Every version of the game includes Cannonbolt as the tenth alien, except for the Nintendo DS game, which gets Murk Upchuck instead.
Here’s where the game differs according to which version you get, though. Nine of those aliens are available in every version of Vilgax attacks: Spidermonkey, Humungosaur, Big Chill, Swampfire, Goop, Brainstorm, Echo Echo, Chromastone, and Jetray.
