From a series of easy readers books comes the Ben10 story 'Ultimate Weapon'. Discover the world of Ben Tennyson, a 10 - year - old kid who proves that anyone can be a hero! The Mask of Ah Puch is the key to the most destructive weapon ever created, and the Tennysons have no choice but to kick some ancient alien butt to stop it falling into the wrong hands! Targeted at children aged 7+ who are learning to read full stories on their own, but would be suitable for younger children if being read to by others. Other Ben 10 adventure stories available separately.