The world is under attack by alien squirrels from outer space! They are destroying cities and razing the countryside. Only Yellow Dog, defender of freedom and Westminster Kennel Club breed champion, can save us from these evil, karate-kicking nut jobs and their feline allies, the Ninja Cats. He can defeat these galactic goons by collecting and eating dog biscuits for energy, aided by the occasional steak, which grants temporary invulnerability from enemy damage. Help Yellow Dog save the planet from total annihilation.