If you've been around any young kids, boys especially, you have probably heard of Ben 10.  First a Cartoon Network show, the series has exploded in popularity and has taken over toy store shelves everywhere.  Unsurprisingly, Ben 10 has made appearances in the video game arena as well.  First was Ben 10: Protector of Earth, and more recently, Ben 10: Alien Force.  Both of these games feature two player co-op, but are they any good? If you look at the Co-Optimus home page, you'll see a list of top games for each system down the right hand side.  Joining powerhouses like Left 4 Dead and Castle Crashers is Ben 10: Protector of Earth.  Surprising, isn't it?  You wouldn't expect a cartoon tie-in to be one of the better co-op experiences on any system, even the Wii.  This high rating is likely due to the fact that the game is fairly old school, similar to classic arcade brawlers, and it has some wild character designs that are quite fun. In case you aren't a Cartoon Network junkie, Ben 10 is about a young boy, Ben Tennyson, who discovers the Omnitrix, a sort of cosmic watch.  The Omnitrix allows Ben to take the form of ten different alien creatures.  This translates very well into a video game.  In Ben 10: Protector of Earth, Ben is limited to five forms.  One is a flaming, human torch style alien.  Another is a four armed, super strong, red humanoid.  My personal favorite is Wildvine, an odd, malleable plant with all sorts of wacky powers.  A bowling ball shaped alien and a blue, skate-footed speedster round out the mix.  Each alien has upgradeable powers, allowing for some visually interesting attacks and even helping to solve the game's light puzzle elements.