The hour-long series will follow what happens when an eclectic group of individuals are forced to survive together as a comet heads towards Earth. Mild-mannered Slough bank manager Jamie is in a rut - albeit a very organised one - consumed by grief for his missing wife. All of that soon changes, however, when he's arrested on suspicion of cyber terrorism and realises that, somehow, he must have an identical twin and that his mum Paula has some serious explaining to do..