The most endearing monsters of children's literature are back on the big screen. Based on the picture books by Julia Donaldson and Axel Scheffler. It is never such a good idea when a Gruffalo, father or son, shows himself in the big, deep forest. He might just be chased by the Grote Boze Muis. But which of the two is scarier now: a Gruffalo or a mouse?