John Henson turns the bakers' worlds upside down when he challenges them to make upside-down cakes without pineapple. Then, judges Carla Hall, Zac Young and Stephanie Boswell are seeing double when the six remaining bakers team up to create twin cakes that look identical but taste completely different. One set of twins is separated as the least successful baker is sent to the 13th floor.

For their final night at the hotel, John Henson asks the bakers to celebrate by creating sweet and savory grazing boards in honor of a dearly departed couple. Then, judges Carla Hall, Stephanie Boswell and Zac Young are invited to the deadliest wedding of their lives when the final bakers create three-tiered black wedding cakes. Only one baker can be crowned Halloween Baking Champion and stay at Hotel Henson ... forever.