Underworld is about a group of kids that end up going on a school trip none of them wanted to go on. Axel – the school bully and thug. Angie – Fat, annoying and jolly. Fiona – a smoker and full of attitude. Liam – the nobody, weak and always the follower never the leader. Zesk – the know-it-all geek who loves himself.
None of them get on or really like each other and Axel participially dislikes the teacher taking them on the trip, Mr Marks who isn’t fond of Axel either. Mrs Soams, the cook at the compound they are staying at tells them of the Local Legend of the Giant Worm, which lives in the caves they are going to be visiting. But it’s just a Legend, or is it? There is an explosion in the caves, then a avalanche leaving them trapped in the caves alone.
They way out if blocked. Mr Marks has been knocked unconscious. They group has to find a way out. With Mr Marks unconscious the group fights for leadership, turning on each other. Will they be able to make it out alive? Will the worm get them? Or will they destroy each other?