Plot: The final bakers take on two very difficult challenges inspired by the past -- all leading up to a time-traveling monster mash! In the Dissection Lab, John Henson works on some gross anatomy, and he asks the bakers to create desserts with gummy hearts that will be "dissected" by judges Carla Hall, Zac Young and Stephanie Boswell. Then in the Quantum Physics Lab, John hops into a time machine and journeys to the ancient past for inspirations like medieval vampires and early aliens for time travel cakes