Three teams compete in the first semi-final, where they have to make designs inspired by myths, monsters, legends and fables - with two spots in the grand final up for grabs. James Richardson and Tim Shaw oversee proceedings, with the creations including the Loch Ness monster being transported by train for a rendezvous with Godzilla and King Kong, a theatrical interpretation of King Arthur's Knights of the Round Table, and a spooky child's bedroom with an enormous devil tree bursting through the floor.