Carl has a nice quiet life – but only until his class gets a substitute teacher. The cynical and merciless substitute, Ulla Harms (Paprika Steen), is dropping like a ruthless bomb into the – by the way – well-functioning kid’s lives. In turn, they immediately complain about their desperate and newfound troubles to their parents. The substitute teacher wants to train her class for an international competition in Paris, but something isn’t right. How is she able to read the kids' minds? Why is she so mean? And how does she manage to convince everyone's parents that she is so great, when the whole class knows she is really an alien?