Decorator Liz Marek and artist Kim Simons face off in an after-hours Hawaiian-themed luau challenge, held at Duff Goldman's bakery; Geof Manthorne and Catherine McCord help judge the results.

Kelly Zubal, the queen of clean cakes, and former punk rocker Wiley Saccheri bring their ultimate monster cakes to life; Haylie Duff and Geof Manthorne judge the results.

Gonzuela Bastarache and Jasmine Frank and Karolyn Plummero are challenged to build ship cakes before the sun comes up; guest judges Kelis and Sherry Yard.

Jackie McGrath's medieval manor vs. Reva Alexander-Hawk's sugary stronghold; guest judges Sherry Yard and Alysia Reiner.

Lachlan Oliver and Kimberly Bailey challenge each other to an overnight superhero cake contest; guest judges Geof Manthorne and Carrie Keagan.

While guest judges Kevin Smith and Elena Fox look on, Amanda Oakleaf shoots for the stars with a gravity-defying confection and Avalon Yarnes phones home with friendly glowing aliens.