We don't need to spell it out for you, do we? But just in case... we're in the middle of an invasion from outer space. It's no hoax! We have the ability to morph into any living thing we touch, courtesy of some mysterious DNA. The aliens? The Yeerks. The situation has gotten serious and we need help. We tried it once, but it didn't go so great. Will you join us in taking on the Yeerks?
