Zombies are one of the most popular monsters in the world - they are undead humans, meaning that they were people who died and then, somehow came back to life as shuffling corpses, with rotting flesh and milky blank eyes. But, is there really any evidence they have ever existed? In this 'we're back' Halooween special Tiernan and Athena have all the evidence to help you decide but you'll have to use your brainszzzzz....