The teams work to wow the judges with confections that bring the element of surprise. Guest judge: chef and baker Nancy Silverton.

The teams wax nostalgic with extra-sweet treats inspired by popular candies. Guest judge: gourmet chocolatier Jonathan Grahm.

The bakers rush to make winning desserts inspired by the judges' favorite holidays. Guest judge: cake designer and pastry chef Thiago Silva.

An ocean theme sends bakers into the deep to make seascapes, aquatic creatures and salty-sweet flavors. Guest judge: chef/restaurateur Richard Blais.

Geeky science-themed challenges get the creative juices flowing -- along with oozy zombie "blood." Guest judge: actor/sci-fi lover Colin Hanks.

The contestants serve up sweets with summery flavors that evoke the great outdoors. Guest judge: "Wet Hot American Summer" creator Michael Showalter.

Fashion-forward challenges force the frazzled contestants to think outside the box. Guest judge: clothing designer Betsey Johnson.

The baking teams pour buzz-worthy ingredients like coffee, honey and alcohol into amazing edible creations. Guest judge: pastry chef Mindy Segal.