It's hard to find a job these days.Art Ellswift was dumb enough and desperate enough to answer a tattered add in a backstreet newsagent for an all-purpose delivery boy.It didn't mention the dimensional travel.Or the killer robots.Or the mad scientists.Or the alien invaders.Or the exploding hippos.It somehow failed to mention that saving the world was also in the job description. Somewhere around page seven.Luckily it was only a short term contract.Nobody...